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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
Nov. 30, 2018
Aug. 31, 2018
Debt Instrument [Line Items]    
Total short-term borrowings $ 16,662 $ 23,600
Long-term borrowings 62,400 62,800
Total 79,062 86,400
Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Total short-term borrowings 15,900  
Series A Notes [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 800 800
Long-term borrowings 18,400 18,800
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Short-term borrowings   20,000
Long-term borrowings 44,000 44,000
Revolving Credit Facility [Member] | Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Short-term borrowings $ 15,862 $ 2,800