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Discontinued operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Discontinued operations |  |  |  |
Net proceeds from sale of discontinued operations |  |  | $ 0 | $ 16,378
Disposal date HVAC subsidiary |  |  | Jun. 26, 2013 |
Net sales | 0 | 874 | 176 | 13,049
(Loss) gain on disposal of discontinued operations | 295 | (12) | 283 | 9,750
(Loss) income from discontinued operations | (5) | (551) | (183) | 1,627
(Loss) income from discontinued operations before income taxes | 290 | (563) | 100 | 11,377
Income tax expense | 25 | (789) | 317 | 1,867
(Loss) income from discontinued operations, net of tax | $ 265 | $ 226 | $ (217) | $ 9,510

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