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Revenue Recognition (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Nov. 30, 2018 | Sep. 01, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | $ (323,000) | $ 61,000 |  |  |
Accrued liabilities | 18,513,000 | 26,240,000 |  |  |
Reduction to revenue | 423,350,000 | 408,518,000 | $ 380,506,000 |  |
Allowance for cash discounts | 72,864,000 | 69,025,000 |  |  |
Other current assets | 7,216,000 | 13,337,000 |  |  |
Contract assets | 0 | 0 |  |  |
Retained Earnings [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | (225,000) | (128,000) |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 300,000
Contract liabilities | 300,000 | $ 1,100,000 |  |  |
Contract liabilities recognized to revenue | 1,100,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 300,000 |
Accounting Standards Update 2014-09 [Member] | Rebate [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | 7,500,000 |  |  |  |
Reduction to revenue | 18,200,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Coupons [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | 200,000 |  |  |  |
Reduction to revenue | 400,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction to revenue | 4,200,000 |  |  |  |
Allowance for cash discounts | 500,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Sales Returns [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accrued liabilities | 400,000 |  |  |  |
Other current assets | $ 100,000 |  |  |  |

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