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Recent accounting pronouncements (Details) $ in Millions | Oct. 31, 2015 USD ($)
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Recent accounting pronouncements [Abstract] |
Deferred debt issuance costs | $ 0.2

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- Definition Recent accounting pronouncements [Abstract] + References No definition available. + Details
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Namespace Prefix: | mfri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
Name: | us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant