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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of Intangible Assets | $ 3,500 | $ 1,300 | $ 7,400 | $ 2,600 |
Amortized intangibles: |  |  |  |  |
Accumulated amortization | (39,251) |  | (39,251) |  | $ (30,470)
Net intangibles | 69,934 |  | 69,934 |  | 75,938
Covenants not to compete |  |  |  |  |
Amortized intangibles: |  |  |  |  |
Gross carrying amount | 1,698 |  | 1,698 |  | 1,702
Supply contracts & customer relationships |  |  |  |  |
Amortized intangibles: |  |  |  |  |
Gross carrying amount | 74,901 |  | 74,901 |  | 75,462
Trade name |  |  |  |  |
Amortized intangibles: |  |  |  |  |
Gross carrying amount | 23,970 |  | 23,970 |  | 23,859
Licenses and databases |  |  |  |  |
Amortized intangibles: |  |  |  |  |
Gross carrying amount | $ 8,616 |  | $ 8,616 |  | $ 5,385

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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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=66006027&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=66006027&loc=d3e16323-109275 + Details
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