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Income taxes Components of income tax expense (benefit) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Components of income tax expense (benefit) [Abstract]    
Current federal tax benefit $ 45us-gaap_CurrentFederalTaxExpenseBenefit $ (245)us-gaap_CurrentFederalTaxExpenseBenefit
Current foreign tax expense 1,834us-gaap_CurrentForeignTaxExpenseBenefit 3,024us-gaap_CurrentForeignTaxExpenseBenefit
State and other (77)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (82)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) 1,802us-gaap_CurrentIncomeTaxExpenseBenefit 2,697us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal income tax (benefit) expense 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,715)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred foreign income tax (benefit) expense 1,439us-gaap_DeferredForeignIncomeTaxExpenseBenefit (475)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and other 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax expense (benefit) 1,439us-gaap_DeferredIncomeTaxExpenseBenefit (3,190)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit) $ 3,241us-gaap_IncomeTaxExpenseBenefit $ (493)us-gaap_IncomeTaxExpenseBenefit