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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Jul. 31, 2013
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (41,711) | $ (34,824)
Net intangibles | 25,384 | 17,706
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,655 | 12,515
Supply contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 28,953 | 26,322
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,834 | 7,389
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,540 | 2,998
Licenses and databases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,113 | $ 3,306

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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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- Definition Amount before 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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- Definition Amount after 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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