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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 |  |

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