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Significant Accounting policies - Additional Information (Detail)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2017
Aug. 25, 2018
USD ($)
Store
Aug. 25, 2018
USD ($)
Store
Aug. 25, 2018
USD ($)
Store
Product
Vendor
shares
Aug. 26, 2017
USD ($)
shares
Aug. 27, 2016
USD ($)
shares
Aug. 29, 2015
USD ($)
Significant Accounting Policies [Line Items]              
Number of stores with commercial sales program | Store   4,741 4,741 4,741      
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 2018, 2017 and 2016 represented 52 weeks.      
Cash and cash equivalents   $ 217,824 $ 217,824 $ 217,824 $ 293,270 $ 189,734 $ 175,309
Allowances for uncollectible accounts   6,100 6,100 6,100 5,900    
Unrecorded adjustment for LIFO value in excess of replacement value   452,400 452,400 452,400 414,900    
Deferred rent   139,600 $ 139,600 $ 139,600 130,200    
Measure of income tax benefit for uncertain income tax positions       More than 50%      
Advertising expense, net of vendor promotional funds       $ 95,200 93,100 98,300  
Vendor promotional funds, which reduced advertising expense       $ 25,300 $ 28,300 $ 21,400  
Limited warranty period, minimum period (Days)       30 days      
Products accounted for total revenues       One class of similar products accounted for approximately 12 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 individual vendor provided more than 10 percent of total purchases.      
U.S. corporate income tax rate 35.00%   21.00% 25.90% 35.00% 35.00%  
Reclassification from accumulated other comprehensive income to retained deficit       $ 14,489      
Accounting Standards Update 2018-02 [Member]              
Significant Accounting Policies [Line Items]              
Reclassification from accumulated other comprehensive income to retained deficit   14,489          
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      
Stock Options [Member]              
Significant Accounting Policies [Line Items]              
Anti-dilutive shares excluded from the computation of earnings per share | shares       847,279 620,025 329,900  
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   $ 51,000 $ 51,000 $ 51,000 $ 48,300    
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       12.00%      
Product Concentration Risk [Member] | Sales Revenue, Net [Member] | Minimum [Member]              
Significant Accounting Policies [Line Items]              
Concentration risk percentage       10.00%      
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       12.00%      
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] | Minimum [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   5,618 5,618 5,618      
Brazil [Member]              
Significant Accounting Policies [Line Items]              
Number of stores | Store   20 20 20      
Mexico [Member]              
Significant Accounting Policies [Line Items]              
Number of stores | Store   564 564 564      
Non-US [Member]              
Significant Accounting Policies [Line Items]              
Cash and cash equivalents   $ 98,800 $ 98,800 $ 98,800 $ 148,400