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Debt (Revolving Credit Facilities) (Narrative) (Details)
9 Months Ended
May 29, 2021
USD ($)
agreement
May 30, 2020
USD ($)
Aug. 29, 2020
USD ($)
Debt Instrument [Line Items]      
Weighted average rate under Credit Facility 1.18%   1.42%
Payments under revolving loans from credit facility $ 365,000,000 $ 578,000,000  
Borrowings under credit facilities 505,000,000 $ 1,012,200,000  
Met Life Note Purchase Agreement [Member]      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity 250,000,000    
Committed Bank Facility [Member]      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 600,000,000    
Maturity date Apr. 14, 2022    
Credit facility, expiration term 5 years    
Outstanding balance $ 187,000,000   $ 250,000,000
Credit facility, current 187,000,000   100,000,000
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity 50,000,000    
Outstanding balance $ 4,235,000   16,742,000
Uncommitted Bank Facilities [Member]      
Debt Instrument [Line Items]      
Number of credit facilities | agreement 2    
Credit facility, current borrowing capacity $ 205,000,000    
Credit facility, expiration term 1 year    
Outstanding balance $ 204,200,000   $ 1,200,000