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Income Taxes Income Taxes - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Income Taxes      
Deferred tax assets unrecognized tax benefits $ 43,206ment_DeferredTaxAssetsUnrecognizedTaxBenefits $ 38,893ment_DeferredTaxAssetsUnrecognizedTaxBenefits  
Undistributed earnings of foreign subsidiaries 482,781us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Possible change in unrecognized tax benefit, lower 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Possible change in unrecognized tax benefit, upper 3,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Income tax penalties and interest expense 884us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (1,710)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (297)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Income tax penalties and interest accrued 8,366us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 7,687us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Unrecognized tax benefits that would impact effective tax rate $ 19,355us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Domestic Tax Authority      
Income Taxes      
Open tax year 2012    
Ireland      
Income Taxes      
Open tax year 2011