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Significant Accounting policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2019 USD ($) Store Product shares | Aug. 25, 2018 USD ($) shares | Aug. 26, 2017 USD ($) shares | Aug. 27, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores with commercial sales program | Store | 4,893 |  |  |
Description of reporting periods | Fiscal Year: The Company’s fiscal year consists of 52 or 53 weeks ending on the last Saturday in August. Fiscal 2019 represented 53 weeks. Fiscal 2018 and 2017 represented 52 weeks. |  |  |
Cash and cash equivalents | $ 176,300 | $ 217,824 | $ 293,270 | $ 189,734
Allowances for uncollectible accounts | 8,500 | 6,100 |  |
Unrecorded adjustment for LIFO value in excess of replacement value | 404,900 | 452,400 |  |
Self insurance reserve | 207,000 | 203,100 |  |
Deferred rent | $ 159,900 | 139,600 |  |
Measure of income tax benefit for uncertain income tax positions | more than 50% |  |  |
Advertising expense, net of vendor promotional funds | $ 87,500 | 95,200 | 93,100 |
Vendor promotional funds, which reduced advertising expense | $ 32,200 | 25,300 | $ 28,300 |
Limited warranty period, minimum period (Days) | 30 days |  |  |
Products accounted for total revenues | one class of similar products accounted for approximately 13 percent of the Company's total revenues, No other class of similar products accounted for 10 percent or more of total revenues |  |  |
Products accounted for total purchases | one vendor supplied approximately 12 percent of the Company's total purchases. No other class of similar products accounted for 10 percent or more of total revenues |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
weighted average discount rate | 3.60% |  |  |
Cash Equivalents [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maturity period of investments | 90 days or less |  |  |
Settlement term of credit and debit card transaction | less than five days |  |  |
Credit and debit card receivables included within cash and cash equivalents | $ 59,400 | $ 51,000 |  |
Product Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of class of similar products accounted for approximately 13% of the company's total revenues | Product | 1 |  |  |
Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Anti-dilutive shares excluded from the computation of earnings per share | shares | 90,314 | 847,279 | 620,025 |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amortization of intangible assets | 3 years |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
ROU assets | $ 2,500 |  |  |
Lease Liabilities | $ 2,500 |  |  |
Minimum [Member] | Building [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 40 years |  |  |
Minimum [Member] | Building Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 5 years |  |  |
Minimum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Minimum [Member] | Product Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 10.00% |  |  |
Minimum [Member] | Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 10.00% |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amortization of intangible assets | 10 years |  |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
ROU assets | $ 2,800 |  |  |
Lease Liabilities | $ 2,800 |  |  |
Maximum [Member] | Building [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 50 years |  |  |
Maximum [Member] | Building Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 15 years |  |  |
Maximum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 10 years |  |  |
Maximum [Member] | Product Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 13.00% |  |  |
Maximum [Member] | Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 12.00% |  |  |
Stores in the United States Including Puerto Rico [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 5,772 |  |  |
Brazil [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 35 |  |  |
Mexico [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 604 |  |  |
Non-US [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 49,900 | $ 98,800 |  |

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