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The option was originally granted on October 23, 2013 and is fully vested."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The two reported transactions involved an amendment of an outstanding option to extend the expiration date resulting in the deemed cancellation of the \"old\" option and the grant of a replacement option. The option was originally granted on October 23, 2013 and is fully vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The two reported transactions involved an amendment of an outstanding option to extend the expiration date resulting in the deemed cancellation of the \"old\" option and the grant of a replacement option. 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Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. 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The vested shares will be delivered to the Reporting Person upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"651 of 2,604 RSUs granted on November 6, 2019 vest on each of November 6, 2020, November 6, 2021, November 6, 2022, and November 6, 2023, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting."}],"balance_after":2604,"derivative":{"underlying":"Class A Common Stock, $0.001 par value","underlying_shares":2604},"source":{"system":"sec-edgar","filing":"0001003078-19-000273","document":"certent-form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1003078/000100307819000273/certent-form4.xml","form_type":"4"}},{"id":3386583,"issuer":{"id":8855,"kind":"organization","name":"MSC INDUSTRIAL DIRECT CO INC","symbol":"MSM"},"owners":[{"id":131373,"kind":"person","name":"POLLI GREGORY","position":1,"cik":"0001671678","reported_name":"POLLI GREGORY","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, PRODUCT MANAGEMENT"}}],"security":"Dividend Equivalent Units","published_at":"2019-10-30T00:06:30.000Z","date":"2019-10-26","kind":"exercise","acquired":false,"shares":37.493,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."}],"balance_after":244,"derivative":{"underlying":"Class A Common Stock, $0.001 par value","underlying_shares":37.493},"source":{"system":"sec-edgar","filing":"0001003078-19-000249","document":"certent-form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1003078/000100307819000249/certent-form4.xml","form_type":"4"}},{"id":3386582,"issuer":{"id":8855,"kind":"organization","name":"MSC INDUSTRIAL DIRECT CO INC","symbol":"MSM"},"owners":[{"id":131373,"kind":"person","name":"POLLI GREGORY","position":1,"cik":"0001671678","reported_name":"POLLI GREGORY","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, PRODUCT MANAGEMENT"}}],"security":"Restricted Stock Units (RSU)","published_at":"2019-10-30T00:06:30.000Z","date":"2019-10-26","kind":"exercise","acquired":false,"shares":452,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each RSU represents a contingent right to receive one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"451 of 2,259 RSUs granted on October 26, 2016 vested on October 26, 2017. 452 RSUs vested on each of October 26, 2018, and October 26, 2019, and 452 RSUs vest October 26, 2020 and October 19, 2021, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date. The vested shares will be delivered to the Reporting Person upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"451 of 2,259 RSUs granted on October 26, 2016 vested on October 26, 2017. 452 RSUs vested on each of October 26, 2018, and October 26, 2019, and 452 RSUs vest October 26, 2020 and October 19, 2021, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date. 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Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes shares acquired under the company's Associate Stock Purchase Plan."}],"balance_after":6931,"source":{"system":"sec-edgar","filing":"0001003078-19-000249","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1003078/000100307819000249/certent-form4.xml","form_type":"4"}},{"id":3386579,"issuer":{"id":8855,"kind":"organization","name":"MSC INDUSTRIAL DIRECT CO INC","symbol":"MSM"},"owners":[{"id":131373,"kind":"person","name":"POLLI GREGORY","position":1,"cik":"0001671678","reported_name":"POLLI GREGORY","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, PRODUCT MANAGEMENT"}}],"security":"Class A Common Stock, $0.001 par value","published_at":"2019-10-30T00:06:30.000Z","date":"2019-10-26","kind":"exercise","acquired":true,"shares":452,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each RSU represents a contingent right to receive one share of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes shares acquired under the company's Associate Stock Purchase Plan."}],"balance_after":6893,"source":{"system":"sec-edgar","filing":"0001003078-19-000249","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1003078/000100307819000249/certent-form4.xml","form_type":"4"}},{"id":3388839,"issuer":{"id":8855,"kind":"organization","name":"MSC INDUSTRIAL DIRECT CO INC","symbol":"MSM"},"owners":[{"id":131373,"kind":"person","name":"POLLI GREGORY","position":1,"cik":"0001671678","reported_name":"POLLI GREGORY","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, PRODUCT MANAGEMENT"}}],"security":"Class A Common Stock, $0.001 par value","published_at":"2019-10-24T23:53:17.000Z","date":"2019-10-22","kind":"tax_withholding","acquired":false,"shares":122,"price":73.99,"value":9026.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Disposition of Class A Common Stock to the Issuer solely to cover tax withholding obligations arising from the vesting of the previous grant of restricted shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes shares acquired under the company's Associate Stock Purchase Plan."}],"balance_after":6441,"source":{"system":"sec-edgar","filing":"0001104659-19-056223","document":"tm1920957d1_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1003078/000110465919056223/tm1920957d1_form4.xml","form_type":"4"}},{"id":3390415,"issuer":{"id":8855,"kind":"organization","name":"MSC INDUSTRIAL DIRECT CO INC","symbol":"MSM"},"owners":[{"id":131373,"kind":"person","name":"POLLI GREGORY","position":1,"cik":"0001671678","reported_name":"POLLI GREGORY","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, PRODUCT MANAGEMENT"}}],"security":"Dividend Equivalent Units","published_at":"2019-10-21T22:47:30.000Z","date":"2019-10-20","kind":"exercise","acquired":false,"shares":22.2026,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. 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The vested shares will be delivered to the Reporting Person upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"366 of 1,831 RSUs granted on October 20, 2017 vested on each of October 20, 2018 and October 20, 2019. 366 RSUs vest on each of October 20, 2020, and October 20, 2021, and 367 RSUs vest on October 20, 2022, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date. 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Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. Each dividend equivalent unit represents a contingent right to receive one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The dividend equivalent units accrued with respect to outstanding awards of restricted stock units (RSUs) and vest at the same time(s) as the underlying RSUs. 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