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Intangibles, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014
Amortized intangible assets: |  |
Gross Carrying Amount | $ 36,824 | $ 38,526
Accumulated Amortization | (18,967) | (13,284)
Intangibles, net | 17,857 | 25,242
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 1,691 | 1,797
Accumulated Amortization | (900) | (615)
Intangibles, net | $ 791 | $ 1,182
Useful life of intangible assets | 3 years | 4 years
Supply contracts & customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 27,506 | $ 29,128
Accumulated Amortization | (13,551) | (9,747)
Intangibles, net | $ 13,955 | $ 19,381
Useful life of intangible assets | 4 years | 5 years
Trade name |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 5,129 | $ 5,791
Accumulated Amortization | (2,467) | (1,479)
Intangibles, net | $ 2,662 | $ 4,312
Useful life of intangible assets | 3 years | 4 years
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 2,498 | $ 1,810
Accumulated Amortization | (2,049) | (1,443)
Intangibles, net | $ 449 | $ 367
Useful life of intangible assets | 2 years | 3 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=26713463&loc=d3e16323-109275 + Details
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