Stock rights	12 Months Ended
Jan. 31, 2014
Stock rights [Abstract]
Stock rights	On September 15, 2009, the Company entered into the Amendment ("Amendment") to Rights Agreement dated as of September 15, 1999. Among other things, the Amendment extends the term of the Rights Agreement until September 15, 2019 and amends definitions to include positions in derivative instruments related to the Company's common stock as constituting beneficial ownership of such stock. On September 15, 1999, the Company's Board of Directors declared a dividend of one common stock purchase right (a "Right") for each share of MFRI's common stock outstanding at the close of business on September 22, 1999. The stock issued after September 22, 1999 and before the redemption or expiration of the Rights is also entitled to one Right for each such additional share. Each Right entitles the registered holders, under certain circumstances, to purchase from the Company one share of MFRI's common stock at $25, subject to adjustment. At no time will the Rights have any voting power. The Rights may not be exercised until 10 days after a person or group acquires 15% or more of the Company's common stock, or announces a tender offer that, if consummated, would result in 15% or more ownership of the Company's common stock. Separate Rights certificates will not be issued and the Rights will not be traded separately from the stock until then. Should an acquirer become the beneficial owner of 15% or more of the Company's common stock, Rights holders other than the acquirer would have the right to buy common stock in MFRI, or in the surviving enterprise if MFRI is acquired, having a value of two times the exercise price then in effect. Also, MFRI's Board of Directors may exchange the Rights (other than those of the acquirer which will have become void), in whole or in part, at an exchange ratio of one share of MFRI common stock (and/or other securities, cash or other assets having equal value) per Right subject to adjustment. The Rights described in this paragraph and the preceding paragraph shall not apply to an acquisition, merger or consolidation approved by the Company's Board of Directors. The Rights will expire on September 15, 2019, unless exchanged or redeemed prior to that date. The redemption price is $0.01 per Right. MFRI's Board of Directors may redeem the Rights by a majority vote at any time prior to the 20th day following public announcement that a person or group has acquired 15% of MFRI's common stock. Under certain circumstances, the decision to redeem requires the concurrence of a majority of the independent directors.

Stock rights

12 Months Ended

Jan. 31, 2014

On September 15, 2009, the Company entered into the Amendment ("Amendment") to Rights Agreement dated as of September 15, 1999. Among other things, the Amendment extends the term of the Rights Agreement until September 15, 2019 and amends definitions to include positions in derivative instruments related to the Company's common stock as constituting beneficial ownership of such stock.

On September 15, 1999, the Company's Board of Directors declared a dividend of one common stock purchase right (a "Right") for each share of MFRI's common stock outstanding at the close of business on September 22, 1999. The stock issued after September 22, 1999 and before the redemption or expiration of the Rights is also entitled to one Right for each such additional share. Each Right entitles the registered holders, under certain circumstances, to purchase from the Company one share of MFRI's common stock at $25, subject to adjustment. At no time will the Rights have any voting power.

The Rights may not be exercised until 10 days after a person or group acquires 15% or more of the Company's common stock, or announces a tender offer that, if consummated, would result in 15% or more ownership of the Company's common stock. Separate Rights certificates will not be issued and the Rights will not be traded separately from the stock until then. Should an acquirer become the beneficial owner of 15% or more of the Company's common stock, Rights holders other than the acquirer would have the right to buy common stock in MFRI, or in the surviving enterprise if MFRI is acquired, having a value of two times the exercise price then in effect. Also, MFRI's Board of Directors may exchange the Rights (other than those of the acquirer which will have become void), in whole or in part, at an exchange ratio of one share of MFRI common stock (and/or other securities, cash or other assets having equal value) per Right subject to adjustment. The Rights described in this paragraph and the preceding paragraph shall not apply to an acquisition, merger or consolidation approved by the Company's Board of Directors.

The Rights will expire on September 15, 2019, unless exchanged or redeemed prior to that date. The redemption price is $0.01 per Right. MFRI's Board of Directors may redeem the Rights by a majority vote at any time prior to the 20th day following public announcement that a person or group has acquired 15% of MFRI's common stock. Under certain circumstances, the decision to redeem requires the concurrence of a majority of the independent directors.