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Acquisitions (Details) $ 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
Total cash paid, net of cash acquired | $ 8,787 | $ 160,812 | $ 0
Acquisitions 2017 [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |
Total acquisition price |  | $ 160,700 |
Allocation of the acquisition: |  |  |
Accounts receivable and prepaid expenses |  | 6,583 |
Vehicle pooling costs |  | 571 |
Property and equipment |  | 10,903 |
Inventory |  | 1,067 |
Intangible assets |  | 72,100 |
Goodwill |  | 77,990 |
Liabilities assumed |  | (8,025) |
Noncontrolling interest |  | (500) |
Fair value of net assets and liabilities acquired |  | $ 160,689 |

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