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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Jul. 31, 2010 | Oct. 31, 2009
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options Exercised | 322,520 |  | 20,000 |  | 40,000 |  | 180,000 |  | 548,334 |  | 177,500 |  | 700,000 |  | 647,262 |
Exercise Price | $ 10.74 |  | $ 9.00 |  | $ 9.00 |  | $ 9.48 |  | $ 11.02 |  | $ 8.47 |  | $ 6.46 |  | $ 6.52 |
Shares Net Settled for Exercise | 131,298 |  | 7,506 |  | 16,082 |  | 76,396 |  | 295,496 |  | 76,050 |  | 245,844 |  | 228,708 |
Shares Withheld for Taxes (1) | 85,684 | [1] | 4,584 | [1] | 8,974 | [1] | 48,366 | [1] | 118,032 | [1] | 37,834 | [1] | 211,654 | [1] | 191,492 | [1]
Net Shares to Employee | 105,538 |  | 7,910 |  | 14,944 |  | 55,238 |  | 134,806 |  | 63,616 |  | 242,502 |  | 227,062 |
Share Price for Withholding | $ 26.38 |  | $ 23.98 |  | $ 22.39 |  | $ 22.33 |  | $ 20.40 |  | $ 19.76 |  | $ 18.38 |  | $ 18.45 |
Tax Withholding (in 000's) | $ 2,260 |  | $ 110 |  | $ 201 |  | $ 1,080 |  | $ 2,408 |  | $ 748 |  | $ 3,890 |  | $ 3,533 |
[1] | Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against the Company's stock repurchase program.

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- Definition Number of shares during the period as a result of the Shares net settled for exercise. + References No definition available. + Details
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- Definition Amount of Tax Expenses Paid by Company releated to the Share-based Compensation to the taxing authority. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + 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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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