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Lease information Rental expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Rental expense [Abstract] |  |
Rental expense for operating leases | $ 2.1 | $ 2.5
Current Fiscal Year End Date | --01-31 |

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- Definition End date of current fiscal year in the format --MM-DD. + References No definition available. + Details
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Namespace Prefix: | dei_
Data Type: | xbrli:gMonthDayItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Period Type: | duration