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Stockholder's Equity (Details Textuals 1) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010 | Sep. 22, 2011 | Jan. 14, 2011
Stock Repurchase [Abstract] |  |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  | 40,000,000 |
Common stock authorized for repurchase (in shares) |  |  |  | 98,000,000 |
Company repurchased common stock (in shares) | 8,880,708 | 13,364,634 | 242,502 |  |
Stock repurchase price per share (in dollars per share) | $ 22.51 | $ 20.42 | $ 18.38 |  |
Number of shares repurchased under the program | 49,786,782 |  |  |  |
Number of shares available for repurchase under Stock Repurchase Program | 48,213,218 |  |  |  |
Purchase of common shares from tender offer |  |  |  |  | 21,052,630
Tender price to purchase common shares |  |  |  |  | $ 19.00
Number of shares accepted for purchase under tender offer |  |  |  |  | 24,344,176
Additional purchase of common shares from tender offer |  |  |  |  | 3,291,546
Threshold limit for purchase of company's additional shares |  |  |  |  | 2.00%
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share) | $ 0.04 |  |  |  |
Remittance to taxing authorities under statutory withholding in fiscal year 2011 and 2012 | $ 2.6 | $ 4.2 | $ 7.4 |  |

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- Definition The dilutive earnings per share impact of all repurchased shares on the weighted average number of common shares outstanding during the period. + References No definition available. + Details
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- Definition Represents the additional number of common shares accepted to be purchased under tender offer. + References No definition available. + Details
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- Definition Represents the maximum number of common shares accepted to be purchased under tender offer. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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