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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
Feb. 29, 2020
Aug. 31, 2019
Debt Instrument [Line Items]    
Total short-term borrowings $ 41,729 $ 21,205
Long-term borrowings 61,117 60,221
Total 102,846 81,426
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 17,600 18,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 25,000 20,000
Long-term borrowings 43,517 42,221
Revolving Credit Facility [Member] | Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Short-term borrowings $ 15,929 $ 405