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Retirement plans 401K (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
401K employee pretax payroll contributions limit 16.00%mfri_A401KEmployeePretaxPayrollContributionsLimit  
maximum % of each participant's salary   50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Effective 1/1/2015 increase in Company's matching contribution 4.00%mfri_CompanyMatchesContribution  
Winchester employer matching contribution 15.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch  
Maximum % of each participant's salary 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent  
Employer contributions to 401K $ 439mfri_EmployerContributionsTo401K $ 430mfri_EmployerContributionsTo401K
Filtration Products [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Maximum % of each participant's salary 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedContributionPlanNameAxis
= mfri_FiltrationProductsMember