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Common Stock Repurchases (Details Textual) - USD ($)
$ in Millions
 3 Months Ended
Oct. 31, 2015
Jan. 31, 2015
Oct. 31, 2014
Sep. 22, 2011
Remittance to taxing authorities under statutory withholding     $ 1.1  
Number of stock options exercised 31,000      
Stock Repurchase Program 2011 [Member]        
Additional common stock authorized for repurchase (in shares)       40,000,000
Common stock authorized for repurchase (in shares)       98,000,000
Number of shares repurchased under the program 50,518,282      
Number of shares available for repurchase under stock repurchase program 47,481,718      
Executive Officers and Certain Employees [Member]        
Number of stock options exercised 0 0