Summary of Significant Accounting Policies (Details Textuals) $ in Thousands	12 Months Ended
	Jul. 31, 2017 Derivative	Jul. 31, 2017 USD ($) Derivative	Jul. 31, 2017 Derivative	Jul. 31, 2017 Derivative Segment	Jul. 31, 2016 USD ($) Derivative	Jul. 31, 2015 USD ($) Derivative
New Accounting Pronouncement, Early Adoption [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 107,600			$ 14,700	$ 0
Stockholders' Equity Note, Stock Split	two-for-one
Business Acquisition, Percentage of Voting Interests Acquired	59.50%	59.50%	59.50%	59.50%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	40.50%	40.50%	40.50%	40.50%
Capitalized Computer Software, Period Increase (Decrease)					$ 29,800
Capitalized Computer Software, Impairments		$ 19,400
Number of interest rate derivatives held | Derivative	0	0	0	0	2	2
Advertising expenses		$ 5,600			$ 6,800	$ 4,900
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		31,188			13,240	3,634
Income tax benefit realized from stock-based payment compensation		$ 0			$ 0	$ 2,971
Number of operating segments			2	2
Number of reportable segment			2	2