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Business segment reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 30, 2015 Segments | Apr. 30, 2014 | Jan. 31, 2015
Segment reporting |  |  |
Number of reportable segments | 2us-gaap_NumberOfReportableSegments |  |
Net sales | $ 37,674us-gaap_SalesRevenueNet | $ 59,524us-gaap_SalesRevenueNet |
Gross profit | 4,041us-gaap_GrossProfit | 15,989us-gaap_GrossProfit |
(Loss) income from operations | (4,800)us-gaap_OperatingIncomeLoss | 5,709us-gaap_OperatingIncomeLoss |
Piping Systems [Member] |  |  |
Segment reporting |  |  |
Segment Reporting Information, Description of Products and Services | Piping Systems, which engineers, designs, manufactures and sells specialty piping, leak detection and location systems |  |
Net sales | 20,277us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember | 42,354us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember |
Gross profit | 2,355us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember | 13,458us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember |
(Loss) income from operations | (1,426)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember | 8,017us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mfri_PipingSystemsMember |
Filtration Products [Member] |  |  |
Segment reporting |  |  |
Segment Reporting Information, Description of Products and Services | Filtration Products, which manufactures custom-designed industrial filtration products to remove particulates from air and other gas streams |  |
Net sales | 17,397us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember | 17,170us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember |
Gross profit | 1,686us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember | 2,531us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember |
(Loss) income from operations | (1,230)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember | (544)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mfri_FiltrationProductsMember |
Corporate Segment [Member] |  |  |
Segment reporting |  |  |
(Loss) income from operations | $ (2,144)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ (1,764)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Credit Concentration Risk [Member] |  |  |
Segment reporting |  |  |
Concentration Risk, Percentage | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember |  | 31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember
Sales Revenue, Net [Member] |  |  |
Segment reporting |  |  |
Concentration Risk, Percentage |  | 21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesRevenueNetMember |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Description of the types of products and services from which the reportable segment derives its revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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