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Commitments and Contingencies (Details Textuals) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 04, 2015 | Jun. 22, 2015 | Jun. 05, 2015 | Jun. 30, 2011 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Major Operating and Capital Expenses [Abstract] |  |  |  |  |  |  |
Outstanding letter of credit |  |  |  |  | $ 15.3 |  |
Facilities Rental Expense |  |  |  |  |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |  |  |  |  |
Rental expense |  |  |  |  | 21.6 | $ 21.7 | $ 26.4
Yard Operations Equipment Rental Expense |  |  |  |  |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |  |  |  |  |
Rental expense |  |  |  |  | $ 3.1 | $ 3.6 | $ 3.0
Georgia Department of Revenue | Insurance-related Assessments |  |  |  |  |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |  |  |  |  |
Sales tax liability contingency | $ 96.1 | $ 100.0 | $ 2.7 | $ 73.8 |  |  |

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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