Income taxes (Details) - Components of income (loss) before income taxes - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
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Jul. 31, 2017 |
Apr. 30, 2017 |
Jan. 31, 2017 |
Oct. 31, 2016 |
Jul. 31, 2016 |
Apr. 30, 2016 |
Jan. 31, 2016 |
Oct. 31, 2015 |
Jul. 31, 2017 |
Jul. 31, 2016 |
Jul. 31, 2015 |
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| Income taxes (Details) - Components of income (loss) before income taxes [Line Items] | |||||||||||
| Income (loss) before taxes | $ 71 | $ (39) | $ (1,000) | $ (1,454) | $ 37,068 | $ (2,113) | $ 7,039 | $ 4,521 | $ (2,422) | $ 46,515 | $ (2,292) |
| Domestic Tax Authority [Member] | |||||||||||
| Income taxes (Details) - Components of income (loss) before income taxes [Line Items] | |||||||||||
| Income (loss) before taxes | (130) | 48,847 | (615) | ||||||||
| Foreign Tax Authority [Member] | |||||||||||
| Income taxes (Details) - Components of income (loss) before income taxes [Line Items] | |||||||||||
| Income (loss) before taxes | $ (2,292) | $ (2,332) | $ (1,677) | ||||||||
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- References No definition available.
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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