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Description of Business and Summary of Significant Accounting Policies (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Oct. 31, 2014
Segment
Jul. 31, 2014
Description Of Business and Summary Of Significant Accounting Policies [Line Items]    
Tax benefits realized upon ultimate settlement, Description The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement.  
Number of operating segments 2  
Number of reportable segment 1  
Capitalized software costs $ 60.6 $ 61.7
Accumulated amortization expense $ 39.4 $ 38.6
Interest Rate Swap
    
Description Of Business and Summary Of Significant Accounting Policies [Line Items]    
Number of interest rate derivatives held 2