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Intangibles, Net (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012
Amortized intangible assets: |  |
Gross Carrying Amount | $ 52,530 | $ 38,444
Accumulated Amortization | (34,824) | (30,459)
Intangibles, net | 17,706 | 7,985
Covenants not to compete |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 12,515 | 11,087
Accumulated Amortization | (10,965) | (10,685)
Intangibles, net | 1,550 | 402
Weighted Average Remaining Useful Life (in years) | 4 years | 4 years
Supply contracts |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 26,322 | 26,041
Accumulated Amortization | (21,757) | (18,762)
Intangibles, net | 4,565 | 7,279
Weighted Average Remaining Useful Life (in years) | 8 years | 6 years
Customer relationships |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 7,389 |
Accumulated Amortization | (395) |
Intangibles, net | 6,994 |
Weighted Average Remaining Useful Life (in years) | 6 years |
Trade name |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 2,998 |
Accumulated Amortization | (402) |
Intangibles, net | 2,596 |
Weighted Average Remaining Useful Life (in years) | 4 years |
Licenses and databases |  |
Amortized intangible assets: |  |
Gross Carrying Amount | 3,306 | 1,316
Accumulated Amortization | (1,305) | (1,012)
Intangibles, net | $ 2,001 | $ 304
Weighted Average Remaining Useful Life (in years) | 3 years | 1 year

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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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- 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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