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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs, which include an aggregate of 66.5402 Dividend Units, vest on April 11, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs, which include an aggregate of 66.5402 Dividend Units, vest on April 11, 2027."}],"balance_after":1570.5402,"derivative":{"underlying":"Common Stock","underlying_shares":5.375},"source":{"system":"sec-edgar","filing":"0001379160-26-000046","document":"form4-09162026_080943.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1379160/000137916026000046/form4-09162026_080943.xml","form_type":"4"}},{"id":4619682,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":25161,"kind":"person","name":"Langan Brian","position":1,"cik":"0002076000","reported_name":"Langan Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:54.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":3.1405,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs, which include an aggregate of 6.5915 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs, which include an aggregate of 6.5915 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."}],"balance_after":917.5915,"derivative":{"underlying":"Common Stock","underlying_shares":3.1405},"source":{"system":"sec-edgar","filing":"0002076000-26-000015","document":"form4-09162026_080949.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2076000/000207600026000015/form4-09162026_080949.xml","form_type":"4"}},{"id":4619681,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":25161,"kind":"person","name":"Langan Brian","position":1,"cik":"0002076000","reported_name":"Langan Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:54.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":1.9165,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs, which include an aggregate of 8.9511 Dividend Units, vest in three equal annual installments beginning on August 4, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs, which include an aggregate of 8.9511 Dividend Units, vest in three equal annual installments beginning on August 4, 2027."}],"balance_after":559.9511,"derivative":{"underlying":"Common Stock","underlying_shares":1.9165},"source":{"system":"sec-edgar","filing":"0002076000-26-000015","document":"form4-09162026_080949.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2076000/000207600026000015/form4-09162026_080949.xml","form_type":"4"}},{"id":4619678,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":5.443,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The RSUs, which include an aggregate of 11.4244 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The RSUs, which include an aggregate of 11.4244 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."}],"balance_after":1590.4244,"derivative":{"underlying":"Common Stock","underlying_shares":5.443},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":4619677,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":2.1902,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs, which include an aggregate of 11.9324 Dividend Units, vest in three equal annual installments beginning on May 20, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The RSUs, which include an aggregate of 11.9324 Dividend Units, vest in three equal annual installments beginning on May 20, 2027."}],"balance_after":639.9324,"derivative":{"underlying":"Common Stock","underlying_shares":2.1902},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":4619676,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":3.5378,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs, which include an aggregate of 29.6984 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs, which include an aggregate of 29.6984 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."}],"balance_after":1033.6984,"derivative":{"underlying":"Common Stock","underlying_shares":3.5378},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":4619675,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":1.9028,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs, which include an aggregate of 15.9696 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs, which include an aggregate of 15.9696 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."}],"balance_after":555.9696,"derivative":{"underlying":"Common Stock","underlying_shares":1.9028},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":4619674,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":2.2122,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs, which include which include an aggregate of 27.3844 Dividend Units, vest on April 11, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs, which include which include an aggregate of 27.3844 Dividend Units, vest on April 11, 2027."}],"balance_after":646.3844,"derivative":{"underlying":"Common Stock","underlying_shares":2.2122},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":4619673,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T20:56:00.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":1.2616,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs, which include an aggregate of 15.6174 Dividend Units, vest on April 11, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs, which include an aggregate of 15.6174 Dividend Units, vest on April 11, 2027."}],"balance_after":368.6174,"derivative":{"underlying":"Common Stock","underlying_shares":1.2616},"source":{"system":"sec-edgar","filing":"0001621819-26-000027","document":"form4-09162026_080955.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1621819/000162181926000027/form4-09162026_080955.xml","form_type":"4"}},{"id":1081,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-09-02T21:37:54.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":32,"price":174.7834,"value":5593.0688,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $174.70 to $174.85, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":103550,"source":{"system":"sec-edgar","filing":"0001379160-26-000043","document":"form4-09022026_090950.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1379160/000137916026000043/form4-09022026_090950.xml","form_type":"4"}},{"id":1080,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-09-02T21:37:54.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":268,"price":174.1276,"value":46666.1968,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price\nwithin such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":103582,"source":{"system":"sec-edgar","filing":"0001379160-26-000043","document":"form4-09022026_090950.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1379160/000137916026000043/form4-09022026_090950.xml","form_type":"4"}},{"id":1079,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-09-02T21:37:54.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":4852,"price":173.0412,"value":839595.9024,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price\nwithin such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":103850,"source":{"system":"sec-edgar","filing":"0001379160-26-000043","document":"form4-09022026_090950.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1379160/000137916026000043/form4-09022026_090950.xml","form_type":"4"}},{"id":1078,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-09-02T21:37:54.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":2348,"price":172.0589,"value":403994.2972,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price\nwithin such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":108702,"source":{"system":"sec-edgar","filing":"0001379160-26-000043","document":"form4-09022026_090950.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1379160/000137916026000043/form4-09022026_090950.xml","form_type":"4"}},{"id":674091,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":19166,"kind":"person","name":"Yellin Jonathan D","position":1,"cik":"0001701764","reported_name":"Yellin Jonathan D","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND GENERAL COUNSEL"}}],"security":"Common Stock","published_at":"2026-08-27T23:36:26.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":400,"price":174.2592,"value":69703.68,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average price. 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The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 10, 2025."}],"balance_after":11153,"source":{"system":"sec-edgar","filing":"0001701764-26-000043","document":"form4-08272026_110822.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000170176426000043/form4-08272026_110822.xml","form_type":"4"}},{"id":674090,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":19166,"kind":"person","name":"Yellin Jonathan D","position":1,"cik":"0001701764","reported_name":"Yellin Jonathan D","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND GENERAL COUNSEL"}}],"security":"Common Stock","published_at":"2026-08-27T23:36:26.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":1307,"price":173.3354,"value":226549.3678,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price in Column 4 is a weighted average price. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs, which include an aggregate of 14.0668 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs, which include an aggregate of 14.0668 Dividend Units, vest in two equal annual installments beginning on April 29, 2027."}],"balance_after":554.0668,"derivative":{"underlying":"Common Stock","underlying_shares":2.091},"source":{"system":"sec-edgar","filing":"0001621819-26-000024","document":"form4-06162026_100611.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000162181926000024/form4-06162026_100611.xml","form_type":"4"}},{"id":736678,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-06-16T22:02:15.000Z","date":"2026-06-12","kind":"grant","planned":false,"acquired":true,"shares":2.431,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs, which include an aggregate of 25.1722 Dividend Units, vest on April 11, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs, which include an aggregate of 25.1722 Dividend Units, vest on April 11, 2027."}],"balance_after":644.1722,"derivative":{"underlying":"Common Stock","underlying_shares":2.431},"source":{"system":"sec-edgar","filing":"0001621819-26-000024","document":"form4-06162026_100611.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000162181926000024/form4-06162026_100611.xml","form_type":"4"}},{"id":736677,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-06-16T22:02:15.000Z","date":"2026-06-12","kind":"grant","planned":false,"acquired":true,"shares":1.3863,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs, which include an aggregate of 14.3558 Dividend Units, vest on April 11, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs, which include an aggregate of 14.3558 Dividend Units, vest on April 11, 2027."}],"balance_after":367.3558,"derivative":{"underlying":"Common Stock","underlying_shares":1.3863},"source":{"system":"sec-edgar","filing":"0001621819-26-000024","document":"form4-06162026_100611.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000162181926000024/form4-06162026_100611.xml","form_type":"4"}},{"id":736676,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":37820,"kind":"person","name":"Holmes Chad M","position":1,"cik":"0001621819","reported_name":"Holmes Chad M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND CHIEF CORP DEV OFFICER"}}],"security":"Restricted Stock Units","published_at":"2026-06-16T22:02:15.000Z","date":"2026-06-12","kind":"grant","planned":false,"acquired":true,"shares":5.9814,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. Dividend equivalent rights accrue with respect to unvested RSUs in the form of additional RSUs ("Dividend Units") when and as dividends are paid on the Issuer's common stock, and Dividend Units vest on the same dates and in the same relative proportions as the RSUs on which they accrue."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs, which include an aggregate of 5.9814 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs, which include an aggregate of 5.9814 Dividend Units, vest in four equal annual installments beginning on April 9, 2027."}],"balance_after":1584.9814,"derivative":{"underlying":"Common Stock","underlying_shares":5.9814},"source":{"system":"sec-edgar","filing":"0001621819-26-000024","document":"form4-06162026_100611.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000162181926000024/form4-06162026_100611.xml","form_type":"4"}},{"id":748580,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-06-05T21:16:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":1100,"price":142.1699,"value":156386.89,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $142.025 to $142.4675, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":111050,"source":{"system":"sec-edgar","filing":"0001379160-26-000034","document":"form4-06052026_090653.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000137916026000034/form4-06052026_090653.xml","form_type":"4"}},{"id":748579,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-06-05T21:16:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":319,"price":136.8585,"value":43657.8615,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $136.41 to $137.375, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":112150,"source":{"system":"sec-edgar","filing":"0001379160-26-000034","document":"form4-06052026_090653.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000137916026000034/form4-06052026_090653.xml","form_type":"4"}},{"id":748578,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-06-05T21:16:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":5581,"price":135.9903,"value":758961.8643,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $135.39 to $136.355, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":112469,"source":{"system":"sec-edgar","filing":"0001379160-26-000034","document":"form4-06052026_090653.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000137916026000034/form4-06052026_090653.xml","form_type":"4"}},{"id":748577,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":924,"kind":"person","name":"Maleh Paul A","position":1,"cik":"0001379160","reported_name":"Maleh Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2026-06-05T21:16:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":500,"price":134.4754,"value":67237.7,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $134.04 to $134.85, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2025."}],"balance_after":118050,"source":{"system":"sec-edgar","filing":"0001379160-26-000034","document":"form4-06052026_090653.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000137916026000034/form4-06052026_090653.xml","form_type":"4"}},{"id":766603,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":19166,"kind":"person","name":"Yellin Jonathan D","position":1,"cik":"0001701764","reported_name":"Yellin Jonathan D","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND GENERAL COUNSEL"}}],"security":"Restricted Stock Units","published_at":"2026-05-22T21:54:01.000Z","date":"2026-05-20","kind":"exercise","planned":false,"acquired":false,"shares":224.5931,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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To the extent vested RSUs are paid in shares of the Issuer's common stock, such shares will be delivered to the reporting person as soon as possible after vesting, but in no event later than two and one-half months after the end of the year in which vesting occurs, subject to the collection of withholding taxes. 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The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 10, 2025."}],"balance_after":14847,"source":{"system":"sec-edgar","filing":"0001701764-26-000031","document":"form4-05202026_090521.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000170176426000031/form4-05202026_090521.xml","form_type":"4"}},{"id":770490,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":19166,"kind":"person","name":"Yellin Jonathan D","position":1,"cik":"0001701764","reported_name":"Yellin Jonathan D","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND GENERAL COUNSEL"}}],"security":"Common Stock","published_at":"2026-05-20T21:53:25.000Z","date":"2026-05-19","kind":"sale","planned":true,"acquired":false,"shares":250,"price":146.3663,"value":36591.575,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price in Column 4 is a weighted average price.  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The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 10, 2025."}],"balance_after":15247,"source":{"system":"sec-edgar","filing":"0001701764-26-000031","document":"form4-05202026_090521.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053706/000170176426000031/form4-05202026_090521.xml","form_type":"4"}},{"id":796018,"issuer":{"id":923,"kind":"organization","name":"CRA INTERNATIONAL, INC.","symbol":"CRAI"},"owners":[{"id":19166,"kind":"person","name":"Yellin Jonathan D","position":1,"cik":"0001701764","reported_name":"Yellin Jonathan D","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP AND GENERAL COUNSEL"}}],"security":"Restricted Stock Units","published_at":"2026-05-01T21:13:34.000Z","date":"2026-04-29","kind":"exercise","planned":false,"acquired":false,"shares":293.3649,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock; vested RSUs are payable in the form of cash, shares of the Issuer's common stock or a combination thereof, except as otherwise indicated below. 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