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Income Taxes (Details 2)
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
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 0.90% 1.10% 1.10%
International rate differential (1.80%) (1.90%) (2.10%)
Compensation and fringe benefits (1) (3.60%) 0.10% 0.10%
Other differences 1.20% (0.50%) (0.30%)
Effective tax rate 31.70% 33.80% 33.80%