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Acquisitions (Details Textual) (USD $)		3 Months Ended						3 Months Ended
	Oct. 31, 2013	Oct. 31, 2013 Minimum	Oct. 31, 2013 Maximum	Oct. 31, 2013 Customer relationships Minimum	Oct. 31, 2013 Customer relationships Maximum	Oct. 31, 2013 Salvage vehicle auction business and auction platform	Jul. 31, 2013 Salvage vehicle auction business and auction platform	Oct. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Minimum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Covenants not to compete Maximum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Minimum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Supply contracts Maximum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Trade name Minimum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Trade name Maximum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Minimum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Licenses and databases Maximum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Software Minimum	Oct. 31, 2013 Salvage vehicle auction business and auction platform Software Maximum
Business Acquisition [Line Items]
Purchase price						$ 88,185,000
Useful life of intangible assets				3 years	8 years			3 years	8 years	3 years	8 years	3 years	8 years	3 years	8 years	3 years	8 years
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Business acquisition preacquisition contingency, Range		7,000,000	28,000,000
Business acquisition preacquisition contingency potential exposure fair value	$ 14,000,000

X

- Definition

Range of amount to be paid or to be received to resolve the preacquisition contingency.

+ References

No definition available.

+ Details

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- Definition

Business acquisition preacquisition contingency potential exposure fair value.

+ References

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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