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Share Repurchase Plan (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | ---
Aug. 31, 2015 | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013 | Feb. 28, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total cost of repurchased shares |  | $ 30,259 | $ 42,773 | $ 31,437 |
2013 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share buy-back plan, amount authorized |  |  |  |  | $ 60,000
Share buy-back plan, number of shares repurchased |  |  |  |  | 848,545
Total cost of repurchased shares |  |  |  |  | $ 60,000
2014 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share buy-back plan, amount authorized | $ 75,000 | $ 75,000 |  |  |
Share buy-back plan, number of shares repurchased | 186,043 |  |  |  |
Total cost of repurchased shares | $ 15,700 |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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