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Common Stock Repurchases (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Jan. 31, 2013 | 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 |
Repurchased common stock (in shares) |  | 500,000 |  |  |
Stock repurchase price per share (in dollars per share) |  | $ 27.77 |  |  |
Value of repurchased common stock |  | $ 13.90 |  |  |
Number of shares repurchased under the program | 50,286,782 |  |  |  |
Number of shares available for repurchase under Stock Repurchase Program | 47,713,218 |  |  |  |
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) | $ 0.01 |  |  |  |
Remittance to taxing authorities under statutory withholding in fiscal year 2014 and 2013 | $ 0.8 |  | $ 0.6 |  |

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- Definition The total number of shares repurchased under the program as if the balance sheet date. + References No definition available. + Details
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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 Represents the threshold percentage limit for purchase of additional common shares. + References No definition available. + Details
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- Definition Represents the price per share paid to acquire company's common stock under stock repurchase program. + 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 04 -Article 3 Reference 2: 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 3: 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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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