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Income Taxes (Provision) Benefit for Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Current Income Tax Expense (Benefit) [Abstract]      
Federal $ (223)us-gaap_CurrentFederalTaxExpenseBenefit $ (366)us-gaap_CurrentFederalTaxExpenseBenefit $ (210)us-gaap_CurrentFederalTaxExpenseBenefit
State 444us-gaap_CurrentStateAndLocalTaxExpenseBenefit 355us-gaap_CurrentStateAndLocalTaxExpenseBenefit (65)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 13,677us-gaap_CurrentForeignTaxExpenseBenefit 6,585us-gaap_CurrentForeignTaxExpenseBenefit 4,964us-gaap_CurrentForeignTaxExpenseBenefit
Total current 13,898us-gaap_CurrentIncomeTaxExpenseBenefit 6,574us-gaap_CurrentIncomeTaxExpenseBenefit 4,689us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) [Abstract]      
Federal and state 7,687ment_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit 1,333ment_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit 350ment_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit
Foreign 996us-gaap_DeferredForeignIncomeTaxExpenseBenefit 1,603us-gaap_DeferredForeignIncomeTaxExpenseBenefit (2,338)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred 8,683us-gaap_DeferredIncomeTaxExpenseBenefit 2,936us-gaap_DeferredIncomeTaxExpenseBenefit (1,988)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision (benefit) for income taxes $ 22,581us-gaap_IncomeTaxExpenseBenefit $ 9,510us-gaap_IncomeTaxExpenseBenefit $ 2,701us-gaap_IncomeTaxExpenseBenefit