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Significant accounting policies Significant accounting policies (Details) | 12 Months Ended
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Jan. 31, 2013
Accounting Policies [Abstract] |
No customer accounts for 10 percent or more | 10.00%

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- Definition No customer accounts for 10 percent or more + References No definition available. + Details
Name: | mfri_NoCustomerAccountsFor10PercentOrMore
Namespace Prefix: | mfri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration