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Revenue Recognition (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
Aug. 31, 2019
Disaggregation of Revenue [Line Items]          
Accrued liabilities $ 18,017,000   $ 18,017,000   $ 18,513,000
Reduction to revenue 98,247,000 $ 113,989,000 296,852,000 $ 316,606,000  
Accounting Standards Update 2014-09 [Member]          
Disaggregation of Revenue [Line Items]          
Contract liabilities 700,000   700,000    
Contract assets 0   0   0
Accounting Standards Update 2014-09 [Member] | Rebate [Member]          
Disaggregation of Revenue [Line Items]          
Accrued liabilities 6,600,000   6,600,000   7,500,000
Reduction to revenue (5,200,000) (4,600,000) (14,600,000) (13,400,000)  
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member]          
Disaggregation of Revenue [Line Items]          
Reduction to revenue (1,100,000) $ (1,200,000) (3,100,000) $ (3,200,000)  
Allowance for cash discount $ 500,000   $ 500,000   $ 500,000