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Intangibles, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017
Amortized intangible assets: |  |
Gross Carrying Amount | $ 106,917 | $ 106,408
Accumulated Amortization | (42,025) | (30,470)
Intangibles, net | 64,892 | 75,938
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 1,666 | 1,702
Accumulated Amortization | (1,656) | (1,389)
Intangibles, net | $ 10 | $ 313
Useful life of intangible assets | 0 years | 1 year
Supply contracts and customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 71,787 | $ 75,462
Accumulated Amortization | (29,601) | (22,248)
Intangibles, net | $ 42,186 | $ 53,214
Useful life of intangible assets | 10 years | 9 years
Trade names |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 24,173 | $ 23,859
Accumulated Amortization | (6,405) | (4,989)
Intangibles, net | $ 17,768 | $ 18,870
Useful life of intangible assets | 1 year | 2 years
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | $ 9,291 | $ 5,385
Accumulated Amortization | (4,363) | (1,844)
Intangibles, net | $ 4,928 | $ 3,541
Useful life of intangible assets | 2 years | 3 years

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