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Intangibles, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2016 | Jul. 31, 2015
Amortized intangible assets: |  |
Gross Carrying Amount | $ 35,824 | $ 36,824
Accumulated Amortization | (24,063) | (18,967)
Intangibles, net | 11,761 | 17,857
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 1,702 | 1,691
Accumulated Amortization | (1,235) | (900)
Intangibles, net | $ 467 | $ 791
Useful life of intangible assets | 2 years | 3 years
Supply contracts and customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 26,471 | $ 27,506
Accumulated Amortization | (17,052) | (13,551)
Intangibles, net | $ 9,419 | $ 13,955
Useful life of intangible assets | 3 years | 4 years
Trade names |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 5,163 | $ 5,129
Accumulated Amortization | (3,423) | (2,467)
Intangibles, net | $ 1,740 | $ 2,662
Useful life of intangible assets | 2 years | 3 years
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 2,488 | $ 2,498
Accumulated Amortization | (2,353) | (2,049)
Intangibles, net | $ 135 | $ 449
Useful life of intangible assets | 1 year | 2 years

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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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