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Revenue Recognition (Narrative) (Details) - USD ($)
 3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Aug. 31, 2020
Disaggregation of Revenue [Line Items]      
Accrued liabilities $ 22,989,000   $ 21,660,000
Reduction to revenue 124,559,000 $ 98,556,000  
Accounting Standards Update 2014-09 [Member]      
Disaggregation of Revenue [Line Items]      
Contract liabilities 2,300,000   1,400,000
Contract assets 0   0
Accounting Standards Update 2014-09 [Member] | Rebate [Member]      
Disaggregation of Revenue [Line Items]      
Accrued liabilities 7,900,000   7,500,000
Reduction to revenue (5,300,000) (5,000,000.0)  
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member]      
Disaggregation of Revenue [Line Items]      
Reduction to revenue (1,200,000) $ (1,000,000.0)  
Allowance for cash discount $ 400,000   $ 500,000