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Commitments and Contingencies (Details Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011
Major Operating and Capital Expenses [Abstract] |  |  |
Outstanding letters of credit | $ 18.8 |  |
Notice of proposed assessment for uncollected sales tax including interest and penalties | 73.8 |  |
Facilities Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | 20.6 | 16.2 | 17.4
Yard Operations Equipment Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | $ 2.8 | $ 2.7 | $ 3.3

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- Details
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- Definition Amount borrowed under the letter of credit facility as of the balance-sheet date + References No definition available. + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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