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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019 | Aug. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | $ 20,627,000 |  | $ 20,627,000 |  | $ 18,513,000
Reduction to revenue | 100,049,000 | $ 101,335,000 | 198,605,000 | $ 202,617,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities | 1,800,000 |  | 1,800,000 |  |
Contract assets | 0 |  | 0 |  | 0
Accounting Standards Update 2014-09 [Member] | Rebate [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | 6,900,000 |  | 6,900,000 |  | 7,500,000
Reduction to revenue | (4,400,000) | (4,500,000) | (9,400,000) | (8,800,000) |
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction to revenue | $ (1,000,000.0) | $ (1,000,000.0) | $ (2,000,000.0) | $ (2,000,000.0) |
Cash discount |  |  |  |  | $ 500,000

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