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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Sep. 01, 2018 | Sep. 02, 2017
Commitments And Contingencies [Line Items] |  |  |
Rental expense, operating leases | $ 13,753 | $ 12,477 | $ 12,541
Maximum [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease expiration date | 2031 |  |
Equipment And Automobile [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease expiration date | 2023 |  |

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- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | msm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The date upon which a lease or a group of leases is set to expire. + References No definition available. + Details
Name: | msm_DateOfLeaseExpiration
Namespace Prefix: | msm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=msm_EquipmentAndAutomobileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |