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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
May 31, 2020
Aug. 31, 2019
Debt Instrument [Line Items]    
Total short-term borrowings $ 70,800,000 $ 21,205,000
Long-term borrowings 94,566,000 60,221,000
Total 165,366,000 81,426,000
Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Total short-term borrowings 0  
Series A Notes [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 800,000 800,000
Long-term borrowings 17,200,000 18,000,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 70,000,000 20,000,000
Long-term borrowings $ 77,366,000 42,221,000
Revolving Credit Facility [Member] | Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Short-term borrowings   $ 405,000