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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 15, 2019 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Class of Stock [Line Items] |  |  |  |
Shares of preferred stock authorized for issuance |  | 14,000,000.0 |  |
Preferred stock issued |  | 0 | 0 |
Preferred stock outstanding |  | 0 | 0 |
Number of shares purchased |  |  | 5,000 |
Cost of common stock shares purchased |  |  | $ 200 |
Number of shares withheld on stock-based compensation awards |  | 147,092 |  |
Values of shares withheld on stock-based compensation awards |  | $ 3,000 |  |
Number of shares withheld for minimum statutory taxes |  |  | 109,896 | 561
Values of shares withheld for minimum statutory taxes |  |  | $ 3,700 | $ 12
Stock repurchased during period, shares | 40,000,000.0 |  |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares withheld on stock-based compensation awards |  | 147,092 |  |
Values of shares withheld on stock-based compensation awards |  | $ 3,000 |  |

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