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Income Taxes (Details 2)
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit 1.10% 1.10% 1.10%
Foreign rate differential (1.90%) (2.10%) (1.80%)
Compensation and fringe benefits 0.10% 0.10% 0.10%
Other differences (0.50%) (0.30%) 0.60%
Effective tax rate 33.80% 33.80% 35.00%