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Stock-Based Compensation (Total Cost Of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 2,370 | $ (5,104) | $ 5,127 | $ (1,460)
Long-Term Incentive Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | 2,144 | (5,326) | 4,458 | (2,124)
Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | 175 | 175 | 525 | 525
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 51 | $ 47 | $ 144 | $ 139

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