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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
Nov. 30, 2017
Aug. 31, 2017
Debt Instrument [Line Items]    
Total short-term borrowings $ 10,800 $ 20,000
Long-term borrowings 153,200 134,000
Total borrowings 164,000 154,000
Series A Notes [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 800  
Long-term borrowings 19,200  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Short-term 10,000 20,000
Long-term borrowings $ 134,000 $ 134,000