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Acquisitions (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 | Jul. 31, 2015 USD ($) | Jul. 31, 2014 business
Acquired salvage vehicle and assets of an online marketing company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Decrease in goodwill |  | $ 0.8 |
Increase in intangible assets |  | $ 0.9 |
Acquired salvage vehicle and assets of an online marketing company [Member] | Covenants not to compete | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Covenants not to compete | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Supply contracts [Member] | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Supply contracts [Member] | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Customer relationships [Member] | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Customer relationships [Member] | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Trade name | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Trade name | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Licenses and databases | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Licenses and databases | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Software [Member] | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 3 years |  |
Acquired salvage vehicle and assets of an online marketing company [Member] | Software [Member] | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Useful life of intangible assets | 8 years |  |
CANADA |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | business |  |  | 1

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