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Acquisitions (Details Textuals) $ in Thousands | 12 Months Ended
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Jul. 31, 2018 USD ($) business | Jul. 31, 2017 USD ($) business | Jul. 31, 2016 USD ($) business
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | business | 1 | 2 | 0
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  | $ 1,900 | $ 0
Goodwill | $ 337,235 | 340,243 | $ 260,198
Intangibles, net | $ 64,892 | $ 75,938 |
Covenants not to compete |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 0 years | 1 year |
Intangibles, net | $ 10 | $ 313 |
Licenses and databases |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 2 years | 3 years |
Intangibles, net | $ 4,928 | $ 3,541 |
Acquisitions 2018 [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |
Total purchase price | $ 8,900 |  |
Acquisitions 2017 [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |
Total purchase price |  | $ 160,700 |
Accounts receivable and prepaid expenses |  | 6,583 |
Vehicle pooling costs |  | 571 |
Property and equipment |  | 10,903 |
Inventory |  | 1,067 |
Intangible assets |  | 72,100 |
Liabilities assumed |  | (8,025) |
Noncontrolling interest |  | (500) |
Fair value of net assets and liabilities acquired |  | $ 160,689 |
Increase (decrease) in goodwill during the period | 1,300 |  |
Indefinite-lived Intangible Assets Acquired | $ 1,200 |  |
Acquisitions 2017 [Domain] | Supply contracts | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquisitions 2017 [Domain] | Supply contracts | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 11 years |  |
Acquisitions 2017 [Domain] | Customer relationships | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquisitions 2017 [Domain] | Customer relationships | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 11 years |  |
Acquisitions 2017 [Domain] | Trade name | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquisitions 2017 [Domain] | Trade name | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 11 years |  |
Acquisitions 2017 [Domain] | Licenses and databases | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquisitions 2017 [Domain] | Licenses and databases | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 11 years |  |
Office Equipment [Member] | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Office Equipment [Member] | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building and Building Improvements [Member] | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building and Building Improvements [Member] | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Leasehold Improvements [Member] | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Leasehold Improvements [Member] | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Software and Software Development Costs [Member] | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Software and Software Development Costs [Member] | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Transportation Equipment [Member] | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Transportation Equipment [Member] | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |

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