Goodwill and intangible assets (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jan. 31, 2016 |
Jul. 31, 2015 |
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| Goodwill and intangible assets (Details) [Line Items] | ||
| Goodwill | $ 7,452 | $ 7,452 |
| Intangible Assets, Amortization Period [Member] | ||
| Goodwill and intangible assets (Details) [Line Items] | ||
| Finite-Lived Intangible Asset, Useful Life | 4 years |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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. No definition available.
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| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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