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Debt And Capital Lease Obligations (Schedule Of Debt) (Details) - USD ($)
Dec. 01, 2018
Sep. 01, 2018
Debt Instrument [Line Items]    
Capital lease and financing obligations $ 29,122,000 $ 27,926,000
Less: unamortized debt issuance costs (1,487,000) (1,593,000)
Total debt 522,635,000 535,333,000
Less: short-term debt [1] (210,979,000) (224,097,000)
Long-term debt 311,656,000 311,236,000
Committed Bank Facility [Member]    
Debt Instrument [Line Items]    
Revolving credit facility   224,000,000
Uncommitted Bank Facilities [Member]    
Debt Instrument [Line Items]    
Revolving credit facility 210,000,000  
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 20,000,000
Prudential Note Purchase Agreement [Member]    
Debt Instrument [Line Items]    
Shelf Facility $ 90,000,000 $ 90,000,000
[1] __________________________Net of unamortized debt issuance costs expected to be amortized in the next twelve months.