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Summary of Significant Accounting Policies (Details Textuals)
$ in Thousands
 12 Months Ended
Jul. 31, 2016
USD ($)
Derivative
Segment
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]      
Excess Tax Benefit from Share-based Compensation, Operating Activities $ 0 $ 2,971 $ 2,289
Capitalized Computer Software, Period Increase (Decrease) $ 29,800    
Capitalized Computer Software, Impairments     29,100
Number of interest rate derivatives held | Derivative 2    
Advertising expenses $ 6,800 4,900 5,000
Available-for-sale Securities, Amortized Cost Basis 21,100    
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 21,500    
Available-for-sale Securities, Gross Realized Gains 400    
Proceeds from stock options exercised 13,240 3,634 10,412
Income tax benefit realized from stock-based payment compensation $ 0 $ 2,971 $ 2,289
Number of operating segments | Segment 2    
Number of reportable segment | Segment 2    
Restatement Adjustment [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Excess Tax Benefit from Share-based Compensation, Operating Activities $ 14,700    
Excess Tax Benefit from Share-based Compensation, Operating Activities 1.292