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Commitments And Contingencies (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Loss Contingencies [Line Items] |  |  |
Rent expense | $ 1,800,000 | $ 2,000,000.0 | $ 2,100,000
Purchase Commitment [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Commitment outstanding | 0 |  |
Indemnification Agreement 1 [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liabilities related to indemnification agreement | 0 |  |
Senior Officers And Directors [Member] | Indemnification Agreement 1 [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liabilities related to indemnification agreement | $ 0 |  |

X
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