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Basis Of Presentation (Schedule Of Cumulative After-Tax Effects On Balance Sheet) (Details) - USD ($) $ in Thousands | May 31, 2019 | Sep. 01, 2018 | Aug. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Deferred income tax assets | $ 6,455 |  | $ 3,222
Liabilities and Shareholders' Equity: |  |  |
Deferred revenue | 45,168 |  | 51,888
Other liabilities | 8,193 |  | 5,501
Retained earnings | 53,528 |  | 63,569
Accounting Standards Update 2014-09 [Member] |  |  |
Assets: |  |  |
Other current assets |  | $ 11,002 | 10,893
Deferred income tax assets | 6,455 | 4,227 | 3,222
Liabilities and Shareholders' Equity: |  |  |
Deferred revenue | 45,168 | 53,896 | 51,888
Other liabilities | 8,193 | 7,750 | 5,501
Retained earnings | $ 53,528 | 60,426 | $ 63,569
ASC 606 Adjustments [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Assets: |  |  |
Other current assets |  | 109 |
Deferred income tax assets |  | 1,005 |
Liabilities and Shareholders' Equity: |  |  |
Deferred revenue |  | 2,008 |
Other liabilities |  | 2,249 |
Retained earnings |  | $ (3,143) |

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