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Summary of Significant Accounting Policies (Details Textuals 2) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Software development costs, gross | $ 38,500,000 | $ 49,400,000 |
Accumulated amortization | 25,700,000 | 20,900,000 |
Capitalized Computer Software, Impairments | 19,400,000 |  |
Retained Insurance Liabilities [Abstract] |  |  |
Amount deductible per claim - insurance policies | 250,000 |  |
Amount deductible per claim - medical policy | 500,000 |  |
Self insured claims reserve | 5,300,000 | 5,300,000 |
Share-based Arrangements with Employees and Nonemployees [Abstract] |  |  |
Proceeds from the exercise of stock options | 31,188,000 | 13,240,000 | $ 3,634,000
Income tax benefit realized from stock-based payment compensation | $ 0 | $ 0 | $ 2,971,000
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Description of useful lives | between five 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 ten years |  |
Buildings and leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Description of useful lives | 5 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) | 10 years |  |
Maximum | Buildings and leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life (in years) | 40 years |  |

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