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Debt And Capital Lease Obligations (Credit Facility) (Narrative) (Details) - USD ($)	3 Months Ended
	Dec. 02, 2017	Dec. 03, 2016
Debt Instrument [Line Items]
Borrowings under Credit Facility	$ 24,000,000	$ 15,000,000
Repayments of debt	65,000,000	$ 78,500,000
New Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 600,000,000
Maturity date	Apr. 14, 2022
Credit facility, expiration term	5 years
Available increase in amount borrowed	$ 300,000,000
Borrowing rate under Credit Facility	2.46%
Repayments of debt	$ 65,000,000
Existing Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under Credit Facility	24,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 50,000,000
Quarterly fronting fee	0.125%
LIBOR [Member] | New Credit Facility [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	1.125%
Federal Funds Effective Rate [Member] | New Credit Facility [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	0.50%
Minimum [Member]
Debt Instrument [Line Items]
Quarterly undrawn fee	0.10%
Minimum [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Usage fee, percent	1.00%
Minimum [Member] | LIBOR [Member] | New Credit Facility [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	1.00%
Minimum [Member] | Leverage Ratio Margin [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	0.00%
Maximum [Member]
Debt Instrument [Line Items]
Quarterly undrawn fee	0.20%
Maximum [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Usage fee, percent	1.375%
Maximum [Member] | LIBOR [Member] | New Credit Facility [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	1.375%
Maximum [Member] | Leverage Ratio Margin [Member]
Debt Instrument [Line Items]
Percentage points in addition to reference rate used in computation of variable rate on debt instrument	0.375%

X

- Definition

Available increase in aggregate amount borrowed

+ References

No definition available.

+ Details

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Namespace Prefix:	msm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fronting fee is the administrative fee paid to the lead credit issuer.

+ References

No definition available.

+ Details

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Namespace Prefix:	msm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Usage fee, percent

+ References

No definition available.

+ Details

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Namespace Prefix:	msm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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X

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Period Type:	duration

X

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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- Details

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- Details

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Namespace Prefix:
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