Income Taxes (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Tax Credit Carryforward, Amount	$ 5,500	$ 5,000
Valuation allowance	6,455	5,420
Unrecognized tax benefits that would impact effective tax rate	13,000	14,000
Interest and penalties related to income tax	5,300	4,900	$ 3,800
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	107,600	14,700	0
Income tax benefit realized from stock-based payment compensation	0	$ 0	$ 2,971
Undistributed Earnings of Foreign Subsidiaries	$ 181,400