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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 08, 2015 | Mar. 27, 2015 | Jan. 23, 2015 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Dec. 14, 2015 | Aug. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares of preferred stock authorized for issuance |  |  |  | 14,000,000 | 14,000,000 |  |  |
Preferred stock issued |  |  |  | 0 | 0 |  |  |
Preferred stock outstanding |  |  |  | 0 | 0 |  |  |
Amount authorized under common stock repurchase plan |  | $ 40,000 |  |  |  |  |  |
Number of shares withheld for minimum statutory taxes |  |  |  | 51,156 | 2,260 | 17,935 |  |
Values of withheld shares |  |  |  | $ 900 | $ 38 | $ 300 |  |
Dutch auction tender offer amount for shares of common stock | $ 35,000 |  |  |  |  |  |  |
Dutch auction tender offer commence date | Dec. 14, 2015 |  |  |  |  |  |  |
Dutch auction tender offer expiration date | Jan. 12, 2016 |  |  |  |  |  |  |
Common stock shares acquired from fully subscribed Dutch auction tender offer |  |  |  |  |  |  | 1,971,832 |
Price per share, common stock share acquired from fully subscribed Dutch auction tender offer |  |  |  |  |  |  | $ 17.75 |
Total tender offer cost |  |  |  |  |  |  | $ 35,300 |
Stock repurchased during period, shares |  |  | 10,000,000 | 1,539,828 |  |  |  |
Stock repurchased during period, value |  |  |  | $ 26,800 |  |  |  |
Cash and cash equivalents |  | 10,000 |  | $ 8,924 | $ 10,456 | $ 16,234 |  | $ 10,483
Minimum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dutch auction tender offer share price of common stock | $ 15.50 |  |  |  |  |  |  |
Available cash for debt financing |  | $ 10,000 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dutch auction tender offer share price of common stock | $ 17.75 |  |  |  |  |  |  |

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