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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