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Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2024	Sep. 02, 2023	Sep. 03, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts receivable, sales transactions fees	$ 18,438	$ 12,175	$ 0
Purchasers
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts receivable, sale	300,000
Accounts receivable, collateral, unsold receivables, amount	$ 349,743	$ 352,385

X

- Definition

Accounts Receivable, Collateral, Unsold Receivables, Amount

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Accounts Receivable, Sales Transactions Fees

+ References

No definition available.

+ Details

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Namespace Prefix:	msm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of decrease from sale of accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-11

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Details

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