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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Aug. 26, 2017 USD ($) Store Product Vendor Branches $ / shares shares | Aug. 27, 2016 USD ($) shares | Aug. 29, 2015 USD ($) shares | Aug. 30, 2014 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores with commercial sales program | Store | 4,592 |  |  |
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 2017, fiscal 2016 and fiscal 2015 represented 52 weeks. |  |  |
Cash and cash equivalents | $ 293,270,000 | $ 189,734,000 | $ 175,309,000 | $ 124,485,000
Allowances for uncollectible accounts | 5,900,000 | 7,400,000 |  |
Unrecorded adjustment for LIFO value in excess of replacement value | 414,900,000 | 364,100,000 |  |
Impairment loss of long lived assets | 0 |  |  |
Deferred rent | $ 130,200,000 | 121,700,000 |  |
Measure of income tax benefit for uncertain income tax positions | More than 50% |  |  |
Advertising expense, net of vendor promotional funds | $ 93,100,000 | 98,300,000 | 98,000,000 |
Vendor promotional funds, which reduced advertising expense | $ 28,300,000 | 21,400,000 | 22,000,000 |
Limited warranty period, minimum period (Days) | 30 days |  |  |
Products accounted for total revenues | One class of similar products accounted for approximately 11 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 10 percent of the Company's total purchases.No other individual vendor provided more than 10 percent of total purchases. |  |  |
Increase of earning per share | $ / shares | $ 0.81 |  |  |
Effective tax rate basis point | 1.62% |  |  |
Tax benefit to earning per share | $ / shares | $ 1.08 |  |  |
Tax reduction to earning per share | $ / shares | $ 0.27 |  |  |
Excess tax benefit |  | $ 63,700,000 | $ 47,900,000 |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amortization of intangible assets | 3 years |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amortization of intangible assets | 10 years |  |  |
Interamerican Motor Corporation [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of operating branches | Branches | 26 |  |  |
Stock Options [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Anti-dilutive shares excluded from the computation of earnings per share | shares | 620,915 | 329,900 | 778 |
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 | $ 48,300,000 | $ 46,800,000 |  |
Product Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of class of similar products accounted for approximately 11% of the company's total revenues | Product | 1 |  |  |
Product Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 11.00% |  |  |
Supplier Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of vendors accounted for approximately 10% of the company's total purchases | Vendor | 1 |  |  |
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage | 10.00% |  |  |
Buildings [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 40 years |  |  |
Buildings [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 50 years |  |  |
Building Improvements [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 5 years |  |  |
Building Improvements [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 15 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 10 years |  |  |
Stores in the United States Including Puerto Rico [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 5,465 |  |  |
Brazil [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 14 |  |  |
Mexico [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | Store | 524 |  |  |
Non-US [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 148,400,000 | $ 78,100,000 |  |

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