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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Sep. 03, 2022	Oct. 03, 2022	Feb. 25, 2022
Class of Stock [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 03, 2022
Current Fiscal Year End Date	--09-03
Document Fiscal Year Focus	2022
Document Transition Report	false
Entity File Number	1-14130
Entity Registrant Name	MSC INDUSTRIAL DIRECT CO., INC.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-3289165
Entity Address, Address Line One	515 Broadhollow Road
Entity Address, City or Town	Suite 1000, Melville
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11747
City Area Code	516
Local Phone Number	812-2000
Title of 12(b) Security	Class A Common Stock, par value $0.001 per share
Trading Symbol	MSM
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 3,576,295,429
Documents Incorporated by Reference [Text Block]	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement to be filed with the United States Securities and Exchange Commission in connection with the registrant’s 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent described herein.
Entity Central Index Key	0001003078
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	Ernst & Young LLP
Auditor Location	Jericho, New York
Auditor Firm ID	42
Class A Common Stock [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		47,219,586
Class B Common Stock [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		8,654,010