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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Oct. 31, 2015 | Jul. 31, 2015
--- | --- | ---
Amortized intangibles: |  |
Accumulated amortization | $ (20,347) | $ (18,967)
Net intangibles | 16,229 | 17,857
Covenants not to compete [Member] |  |
Amortized intangibles: |  |
Gross carrying amount | 1,670 | 1,691
Supply contracts & customer relationships [Member] |  |
Amortized intangibles: |  |
Gross carrying amount | 27,282 | 27,506
Trade names [Member] |  |
Amortized intangibles: |  |
Gross carrying amount | 5,133 | 5,129
Licenses and databases [Member] |  |
Amortized intangibles: |  |
Gross carrying amount | $ 2,491 | $ 2,498

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