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Debt And Capital Lease Obligations (Shelf Facility Agreements) (Narrative) (Details)
 9 Months Ended
Jun. 02, 2018
USD ($)
Line of Credit Facility [Line Items]  
Maximum consolidated leverage ratio of total indebtedness to EBITDA 3.00
Maximum consolidated leverage ratio of total indebtedness to EBITDA after material acquisition 3.50
Minimum consolidated interest coverage ratio of EBITDA to total interest expense 3.00
Met Life Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity $ 250,000,000
Prudential Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity 250,000,000
Remaining borrowing capacity 200,000,000
Senior Notes [Member] | Prudential Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Principal amount $ 50,000,000
Interest rate 3.04%