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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2019 | Nov. 30, 2018 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | Sep. 01, 2018 | Aug. 31, 2018 | Nov. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  | $ (324,000) |  |  |  |  |  | $ 61,000
Accrued liabilities | 19,424,000 |  |  | 19,424,000 |  |  | $ 26,240,000 |
Revenue | 101,335,000 |  | 101,256,000 | 202,617,000 | 198,853,000 |  |  |
Net trade receivables | 75,239,000 |  |  | 75,239,000 |  |  | 69,025,000 |
Other current assets | 8,079,000 |  |  | 8,079,000 |  |  | $ 13,337,000 |
Contract assets | 0 |  |  | 0 |  | $ 0 |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  | (324,000) |  |  |  |  |  | $ (128,000)
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Contract liabilities | 1,200,000 |  |  | 1,200,000 |  | $ 1,100,000 |  |
Contract liabilities recognized to revenue |  | $ 1,100,000 |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Rebate [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Accrued liabilities | 8,400,000 |  |  | 8,400,000 |  |  |  |
Revenue | 4,500,000 |  |  | 8,800,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Coupons [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Accrued liabilities | 200,000 |  |  | 200,000 |  |  |  |
Revenue | 100,000 |  |  | 200,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue | 1,000,000 |  |  | 2,000,000 |  |  |  |
Net trade receivables | 400,000 |  |  | 400,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Sales Returns [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Accrued liabilities | 400,000 |  |  | 400,000 |  |  |  |
Other current assets | $ 100,000 |  |  | $ 100,000 |  |  |  |

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