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Business And Summary Of Significant Accounting Policies (Change In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Sep. 01, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill, Beginning Balance | $ 674,998 |  | $ 633,728 |
Acquisition | 2,872 | [1] | 41,939 | [2]
Post-closing working capital adjustment from acquisition |  |  | 738 |
Foreign currency translation adjustments | (604) |  | (1,407) |
Goodwill, Ending Balance | $ 677,266 |  | 674,998 |
MSC Mexico [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage | 75.00% |  |  |
DECO Tool Supply Co. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Post-closing working capital adjustment from acquisition | $ 738 |  |  |
All Integrated Solutions ("AIS") [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Post-closing working capital adjustment from acquisition |  |  | $ 1,155 |
Ownership percentage |  |  | 100.00% |
TAC Insumos Industriales [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Post-closing working capital adjustment from acquisition | $ 2,286 |  |  |
[1] | Two subsidiaries of the Company, MSC IndustrialSupply, S. de R.L. de C.V. and MSC Import Export LLC (together, "MSC Mexico"), completed the acquisition of certain assets of TAC Insumos Industriales, S. de R.L. de C.V. and certain of its affiliates (together, "TAC") in February 2019, including post-closing working capital adjustment of $2,286. The Company holds a 75% interest in each of the MSC Mexico entities
[2] | Acquired All Integrated Solutions, Inc. ("AIS") in April 2018, including post-closing working capital adjustment of $1,155.

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