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Debt And Capital Lease Obligations (Schedule Of Debt) (Details) - USD ($)
Sep. 01, 2018
Sep. 02, 2017
Debt Instrument [Line Items]    
Capital lease and financing obligations $ 27,926,000 $ 27,829,000
Less: unamortized debt issuance costs (1,593,000) (1,852,000)
Total debt 535,333,000 532,977,000
Less: short-term debt [1] (224,097,000) (331,986,000)
Long-term debt 311,236,000 200,991,000
New Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit Facility 224,000,000 332,000,000
Shelf Facility Agreement [Member]    
Debt Instrument [Line Items]    
Principal amount 90,000,000  
Senior Notes Series A [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount 75,000,000 75,000,000
Senior Notes Series B [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount 100,000,000 $ 100,000,000
Senior Notes Due June 11, 2025 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount $ 20,000,000  
[1] Net of unamortized debt issuance costs expected to be amortized in the next 12 months.