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Discontinued operations (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jan. 31, 2016
Discontinued operations |  |
Disposal Date |  | Jan. 29, 2016
Sale price of discontinued operations |  | $ 22,000
Net proceeds from divestiture of businesses |  | $ 18,400
escrow | $ 500 |

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