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Intangibles, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016
Amortized intangible assets: |  |
Gross Carrying Amount | $ 106,408 | $ 35,824
Accumulated Amortization | (30,470) | (24,063)
Intangibles, net | 75,938 | 11,761
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 1,702 | 1,702
Accumulated Amortization | (1,389) | (1,235)
Intangibles, net | $ 313 | $ 467
Useful life of intangible assets | 1 year | 2 years
Supply contracts and customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 75,462 | $ 26,471
Accumulated Amortization | (22,248) | (17,052)
Intangibles, net | $ 53,214 | $ 9,419
Useful life of intangible assets | 9 years | 3 years
Trade names |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 23,859 | $ 5,163
Accumulated Amortization | (4,989) | (3,423)
Intangibles, net | $ 18,870 | $ 1,740
Useful life of intangible assets | 2 years | 2 years
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 5,385 | $ 2,488
Accumulated Amortization | (1,844) | (2,353)
Intangibles, net | $ 3,541 | $ 135
Useful life of intangible assets | 3 years | 1 year

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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