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Commitments and Contingencies (Details Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Major Operating and Capital Expenses [Abstract] |  |  |
Outstanding letters of credit | $ 6.7 |  |
Notice of proposed assessment for uncollected sales tax including interest and penalties | 73.8 |  |
Environmental matters remedition expenses reserves | 3.0 |  |
Environmental matters cover costs | 0.2 |  |
Facilities Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | 16.2 | 17.4 | 16.8
Yard Operations Equipment Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | $ 2.7 | $ 3.3 | $ 4.1

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- Definition Amount held by the company to cover the cost. + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount held for remediation expenses reserves. + References No definition available. + Details
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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 Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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