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Intangibles, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2019 | Jul. 31, 2018
Amortized intangible assets: |  |
Gross Carrying Amount | $ 80,298 | $ 106,917
Accumulated Amortization | (25,142) | (42,025)
Intangibles, net | 55,156 | 64,892
Supply contracts and customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 49,109 | 71,787
Accumulated Amortization | (11,900) | (29,601)
Intangibles, net | $ 37,209 | $ 42,186
Useful life of intangible assets | 9 years | 10 years
Trade names |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 23,501 | $ 24,173
Accumulated Amortization | (8,010) | (6,405)
Intangibles, net | $ 15,491 | $ 17,768
Useful life of intangible assets | 7 years | 1 year
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 7,688 | $ 9,291
Accumulated Amortization | (5,232) | (4,363)
Intangibles, net | $ 2,456 | $ 4,928
Useful life of intangible assets | 2 years | 2 years
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 0 | $ 1,666
Accumulated Amortization | 0 | (1,656)
Intangibles, net | $ 0 | $ 10
Useful life of intangible assets | 0 years | 0 years

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