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Significant accounting policies Drafts payable (Details) (USD $) In Millions, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013
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Drafts payable [Abstract] |  |
Drafts payable | $ 0.2 | $ 3.3

X
- Details
Name: | mfri_DraftsPayableAbstract
Namespace Prefix: | mfri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amounts due on drafts payable on the balance sheet date. + References No definition available. + Details
Name: | us-gaap_DraftsPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant