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Share Repurchase Program (Details) - USD ($) $ in Thousands | Oct. 31, 2017 | Jul. 31, 2017 | Oct. 31, 2016 | Dec. 04, 2015 | Jul. 16, 2008 | Mar. 09, 2006
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Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Number of shares authorized to repurchase | 7,500,000 |  |  |  |  | 3,000,000
Additional number of shares authorized to repurchase |  |  |  | 1,500,000 | 3,000,000 |
Number of shares repurchased since inception | 5,436,000 | 5,436,000 | 5,435,000 |  |  |
Value of stock repurchased since inception | $ 247,189 | $ 247,189 | $ 246,979 |  |  |
Remaining shares available for repurchase under existing program | 2,063,706 |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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