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Intangibles, Net (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2012 | Jul. 31, 2011
Amortized intangible assets: |  |
Gross Carrying Amount | $ 38,444 | $ 39,471
Accumulated Amortization | (30,459) | (26,723)
Intangibles, net | 7,985 | 12,748
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 11,087 | 10,896
Accumulated Amortization | (10,685) | (10,486)
Intangibles, net | 402 | 410
Weighted Average Remaining Useful Life (in years) | 4 years | 3 years
Supply contracts |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 26,041 | 27,238
Accumulated Amortization | (18,762) | (15,409)
Intangibles, net | 7,279 | 11,829
Weighted Average Remaining Useful Life (in years) | 6 years | 3 years
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 1,316 | 1,337
Accumulated Amortization | (1,012) | (828)
Intangibles, net | $ 304 | $ 509
Weighted Average Remaining Useful Life (in years) | 1 year | 3 years

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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=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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