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Share Repurchases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | Jul. 22, 2015 | Jan. 03, 2014
Share Repurchases [Abstract] |  |  |  |  |
Repurchase authorization amount |  |  |  |  | $ 150,000
Increase in share repurchase authorization |  |  |  | $ 100,000 |
Number of shares of common stock repurchased during the period | 688,790 | 1,198,089 |  |  |
Aggregate purchase price of shares repurchased | $ 48,335 | $ 96,883 | $ 41,059 |  |
Remaining amount available under the repurchase program | $ 63,700 |  |  |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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