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Share Repurchase Program (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Jul. 31, 2016 | Dec. 04, 2015 | Jul. 16, 2008 | Mar. 09, 2006
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to repurchase | 7,500,000 |  | 7,500,000 |  |  |  |  | 3,000,000
Additional number of shares authorized to repurchase |  |  |  |  |  | 1,500,000 | 3,000,000 |
Treasury Stock, Shares, Acquired | 0 | 108,036 | 1,317 | 485,866 |  |  |  |
Payments for Repurchase of Common Stock |  | $ 13,800 | $ 210 | $ 53,787 |  |  |  |
Number of shares repurchased since inception | 5,436,294 | 5,434,977 | 5,436,294 | 5,434,977 | 5,434,977 |  |  |
Value of stock repurchased since inception | $ 247,189 | $ 246,979 | $ 247,189 | $ 246,979 | $ 246,979 |  |  |
Remaining shares available for repurchase under existing program | 2,063,706 |  | 2,063,706 |  |  |  |  |

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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=66902209&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 The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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