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Recent accounting pronouncements (Details) $ in Millions	Jul. 31, 2015 USD ($)
Recent accounting pronouncements [Abstract]
Deferred debt issuance costs	$ 0.4

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- Definition

Recent accounting pronouncements [Abstract]

+ References

No definition available.

+ Details

Name:	mfri_RecentAccountingPronouncementsAbstract
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