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Fair Value Measurement Level 3 Unobservable Inputs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 30, 2015
Unobservable Inputs [Abstract]  
Total estimated contingent consideration, low $ 871us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow
Total estimated contingent consideration, high $ 4,794us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Discount rate, low 9.50%ment_BusinessCombinationContingentConsiderationDiscountRateRangeOfOutcomesValueLow
Discount rate, high 16.00%ment_BusinessCombinationContingentConsiderationDiscountRateRangeOfOutcomesValueHigh
Timing of cash flows (in years), low 1ment_BusinessCombinationContingentConsiderationTimingOfCashFlowsRangeOfOutcomesValueLow
Timing of cash flows (in years), high 3ment_BusinessCombinationContingentConsiderationTimingOfCashFlowsRangeOfOutcomesValueHigh