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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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- 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

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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.

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