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Acquisitions (Details) $ in Thousands | 12 Months Ended
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Jul. 31, 2017 USD ($) business | Jul. 31, 2016 USD ($) business | Jul. 31, 2015 USD ($) business
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | business | 2 | 0 | 0
Total cash paid, net of cash acquired | $ 160,812 | $ 0 | $ 0
Acquisitions 2017 [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |
Total acquisition price | $ 160,800 |  |
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 | 70,900 |  |
Goodwill | 79,256 |  |
Liabilities assumed | (7,968) |  |
Noncontrolling interest | (500) |  |
Fair value of net assets and liabilities acquired | $ 160,812 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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