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Fair value of financial instruments (Details)
$ in Millions
9 Months Ended
Oct. 31, 2015
USD ($)
Rate
Notional value Denmark swap $ 1.3
Interest rate swap, maturity date Dec. 31, 2021
swap fixed interest rate | Rate 2.47%
Fair Value, Inputs, Level 2 [Member]  
Swap mark to market other long-term liability $ 0.1