Summary of Significant Accounting Policies (Details Textuals 2) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Property, Plant and Equipment [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 21,300	$ 107,600	$ 14,700
Software development costs, gross	30,700	38,500
Accumulated amortization	16,000	25,700
Capitalized Computer Software, Impairments		19,400
Share-based Arrangements with Employees and Nonemployees [Abstract]
Proceeds from the exercise of stock options	$ 44,459	$ 31,188	$ 13,240
Leasehold improvements
Property, Plant and Equipment [Line Items]
Description of useful lives	between seven and ten years
Internally developed or purchased software
Property, Plant and Equipment [Line Items]
Description of useful lives	three to seven years
Transportation and other equipment
Property, Plant and Equipment [Line Items]
Description of useful lives	three to twenty years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Description of useful lives	three to five years
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Description of useful lives	7 to 40 years or the lease term, whichever is shorter
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Minimum | Internally developed or purchased software
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Minimum | Transportation and other equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Minimum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Minimum | Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Maximum | Internally developed or purchased software
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Maximum | Transportation and other equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	20 years
Maximum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Maximum | Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	40 years