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Retirement plans Reconciliation of benefit obligations, plan assets and funded status (Details) (USD $)
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Defined benefit plan vested benefit obligation $ 7,626,000mfri_DefinedBenefitPlanVestedBenefitObligation $ 6,243,000mfri_DefinedBenefitPlanVestedBenefitObligation  
Defined Benefit Plan, Accumulated Benefit Obligation 8,129,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 6,827,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Defined Benefit Plan, Benefit Obligation 8,129,000us-gaap_DefinedBenefitPlanBenefitObligation 6,827,000us-gaap_DefinedBenefitPlanBenefitObligation 7,240,000us-gaap_DefinedBenefitPlanBenefitObligation
Service cost 0us-gaap_DefinedBenefitPlanServiceCost 78,000us-gaap_DefinedBenefitPlanServiceCost  
Interest cost 299,000us-gaap_DefinedBenefitPlanInterestCost 293,000us-gaap_DefinedBenefitPlanInterestCost  
Actuarial (gain) loss 1,249,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses (539,000)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Benefits paid (246,000)us-gaap_DefinedBenefitPlanBenefitsPaid (245,000)us-gaap_DefinedBenefitPlanBenefitsPaid  
Defined Benefit Plan, Fair Value of Plan Assets 6,168,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 6,351,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 6,065,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined benefit -plan, actual gain on plan assets 63,000us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 531,000us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Unfunded status (1,961,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (476,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Defined benefit plan, current assets 352,000us-gaap_DefinedBenefitPlanCurrentAssets 335,000us-gaap_DefinedBenefitPlanCurrentAssets  
Defined benefit plan, assets for plan benefits, other assets 1,163,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 1,038,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent  
Defined benefit plans, other long-term liabilities (3,476,000.00)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent (1,849,000)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent  
Defined benefit plan, net amount recognized (1,961,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet (476,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet  
OCI unrecognized actuarial loss 3,124,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 1,513,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax  
OCI net amount recognized $ 3,124,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax $ 1,513,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax