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Debt - Additional Information (Details)
12 Months Ended
Aug. 24, 2018
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2018
USD ($)
Aug. 24, 2018
CAD ($)
Aug. 23, 2018
USD ($)
Aug. 23, 2018
CAD ($)
Aug. 31, 2016
USD ($)
Debt Instrument [Line Items]                
Tax Exempt Economic Development Revenue Bond               $ 8,000,000
Repayments of Debt     $ 8,000,000          
For Certain Obligations Workers Compensation And Performance Bonds                
Debt Instrument [Line Items]                
Letters of credit outstanding, amount   $ 10,000,000   $ 10,000,000        
Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity $ 700,000,000       $ 15,000,000 $ 335,000,000 $ 15,000,000  
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 3,000,000              
Credit Facility, Term 5 years              
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Minimum                
Debt Instrument [Line Items]                
Line of Credit Facility, Commitment Fee Percentage   0.15%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Maximum                
Debt Instrument [Line Items]                
Line of Credit Facility, Commitment Fee Percentage   0.45%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 1 | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.25%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 1 | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   2.75%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 2 | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.75%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 2 | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   0.00%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 2 | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.50%            
Line of Credit | Senior Secured Revolving Credit Facility | Bank of America NA And Other Lenders | Amended Credit Agreement, Interest Rate Option 2 | Federal Funds Effective Swap Rate                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   0.50%            
Line of Credit | Secured Revolving Credit Facility | Bank of America NA And Other Lenders                
Debt Instrument [Line Items]                
Bank revolving credit facilities, interest primarily at LIBOR plus a spread   $ 96,835,000   $ 100,000,000        
Long-term Debt, Weighted Average Interest Rate, at Point in Time   3.78%   3.57%