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Income taxes Income tax narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Components of deferred income tax assets [Line Items] |  |
Foreign Earnings Repatriated | $ 23,200 |
Other Information Pertaining to Income Taxes | This income is fully offset by the use of NOL carryforwards and the current year domestic loss, resulting in no regular tax on the income. |
Federal rate change, new percentage | 21.00% |
Federal rate change | $ 2,243 | $ 0
State benefit, net of federal income tax effect | $ (440) | (103)
Federal Rate, Percent | 33.83% |
Federal operating loss carryforward, gross | $ 12,700 |
Federal operating loss carryforward expires | Jan. 31, 2031 |
State NOL carryforward | $ 2,157 | 1,574
State operating loss carryforwards, expiration dates | expire at various times from 2022 to 2031 |
Domestic valuation allowance, methodologies and assumptions | The Company continues to have a valuation allowance on its domestic DTAs since domestic losses continue to be generated. |
Foreign tax credit | $ 9,749 | $ 4,695
Tax credit carryforward, expiration date | Jan. 31, 2022 |
UTP penalties and interest accrued is less than | $ 100 |
UTP that would impact effective tax rate | $ 1,301 |
Income tax examination, description | The Internal Revenue Service, ("IRS"), began an audit of the fiscal year ended January 31, 2015 in August 2016. In 2017, the tax audit concluded with no change 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 |
Middle East [Member] |  |
Components of deferred income tax assets [Line Items] |  |
Federal operating loss carryforward, gross | $ 300 |

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