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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | $ 2,900 | $ 3,800 |
Amortized intangibles: |  |  |
Accumulated amortization | (45,309) |  | $ (42,025)
Net intangibles | 62,897 |  | 64,892
Covenants not to compete |  |  |
Amortized intangibles: |  |  |
Gross carrying amount | 1,668 |  | 1,666
Supply contracts & customer relationships |  |  |
Amortized intangibles: |  |  |
Gross carrying amount | 73,105 |  | 71,787
Trade name |  |  |
Amortized intangibles: |  |  |
Gross carrying amount | 24,092 |  | 24,173
Licenses and databases |  |  |
Amortized intangibles: |  |  |
Gross carrying amount | $ 9,341 |  | $ 9,291

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