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Significant accounting policies Drafts payable (Details) - USD ($) $ in Millions	Jan. 31, 2016	Jan. 31, 2015
Drafts payable [Abstract]
Drafts payable	$ 0.3	$ 0.6

Drafts payable [Abstract]

No definition available.

Name:	mfri_DraftsPayableAbstract
Namespace Prefix:	mfri_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amounts due on drafts payable on the balance sheet date.

No definition available.

Name:	us-gaap_DraftsPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant