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Stock Repurchase Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Apr. 30, 2013 | Jul. 31, 2012 | Apr. 30, 2012 | Jul. 16, 2008 | Mar. 09, 2006
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Payments for Repurchase of Equity [Abstract] |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  | 3,000,000
Additional number of shares authorized to repurchase |  |  |  | 3,000,000 |
Number of shares repurchased since inception | 4,949,111 | 4,949,111 | 4,468,181 |  |
Value of stock repurchased since inception | $ (193,192) | $ (193,192) | $ (170,696) |  |
Remaining shares available for repurchase under existing program | 1,050,889 |  |  |  |

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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 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 + Details
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