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Acquisitions (Details Textuals) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2016 USD ($) business | Jul. 31, 2015 USD ($) business | Jul. 31, 2014 USD ($) business
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | business | 0 | 0 |
Goodwill | $ 260,198 | $ 271,850 | $ 283,780
Intangibles, net | $ 11,761 | $ 17,857 |
Covenants not to compete |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 2 years | 3 years |
Intangibles, net | $ 467 | $ 791 |
Licenses and databases |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 1 year | 2 years |
Intangibles, net | $ 135 | $ 449 |
2014 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price |  |  | $ 14,500
Increase (decrease) in goodwill during the period |  | (800) |
Increase in intangible assets |  | $ 900 |
2014 Acquisitions | Covenants not to compete | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  |  | 3 years
2014 Acquisitions | Covenants not to compete | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  |  | 8 years
2014 Acquisitions | Supply contracts | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 3 years |
2014 Acquisitions | Supply contracts | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 8 years |
2014 Acquisitions | Customer relationships | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 3 years |
2014 Acquisitions | Customer relationships | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 8 years |
2014 Acquisitions | Trade name | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 3 years |
2014 Acquisitions | Trade name | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 8 years |
2014 Acquisitions | Licenses and databases | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 3 years |
2014 Acquisitions | Licenses and databases | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets |  | 8 years |
CA |  |  |
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | business |  |  | 1

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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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