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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020 | Aug. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | $ 24,728,000 |  | $ 24,728,000 |  | $ 21,660,000
Reduction to revenue | 136,405,000 | $ 98,247,000 | 372,869,000 | $ 296,852,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities | 2,200,000 |  | 2,200,000 |  | 1,400,000
Contract assets | 0 |  | 0 |  | 0
Accounting Standards Update 2014-09 [Member] | Rebate [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | 8,500,000 |  | 8,500,000 |  | 7,500,000
Reduction to revenue | (7,500,000) | (5,200,000) | (20,200,000) | (14,600,000) |
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction to revenue | (1,300,000) | $ (1,100,000) | (3,600,000) | $ (3,100,000) |
Allowance for cash discount | $ 500,000 |  | $ 500,000 |  | $ 500,000

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