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Income taxes Income tax narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016
Components of deferred income tax assets [Line Items] |  |
Repatriation | $ 1,338 | $ 821
Deferred Tax Liability Not Recognized, Determination of Deferred Tax Liability is Not Practicable, Undistributed Earnings of Foreign Subsidiaries | Determination of the amount of unrecognized deferred income tax liabilities on these earnings is not practicable, because such liability, if any, is dependent on circumstances existing if and when remittance occurs. |
Suspended excess tax (benefit) expense from stock options exercised | $ 300 |
State NOL carryforward | 1,877 | 1,419
Federal operating loss carryforward, gross | $ 28,400 |
Federal operating loss carryforward expires | Jan. 31, 2031 |
Operating Loss Carryforwards, expiration dates | expire at various times from 2017 to 2031 |
Foreign tax credit | $ 4,695 | 2,861
Valuation Allowance, Methodologies and Assumptions | The Company continues to have a valuation allowance on its domestic DTAs since domestic losses continue to be generated. |
Tax Credit Carryforward, Expiration Date | Jan. 31, 2022 |
Undistributed earnings of foreign subsidiaries | $ 36,600 |
Income Tax Examination, Description | No changes were made to the reported tax |
Open Tax Year | 2014 |
Open tax years up to the amount of research tax credit generated | January 31, 2002 through January 31, 2009 |
India |  |
Components of deferred income tax assets [Line Items] |  |
Repatriation | $ 100 | 200
Foreign Earnings Repatriated | 500 | $ 2,800
Middle East [Member] |  |
Components of deferred income tax assets [Line Items] |  |
Foreign tax credit | $ 100 |

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