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Discontinued operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 | Jul. 31, 2013
Discontinued operations |  |  |  |
Net proceeds from sale of discontinued operations |  |  | $ 0 | $ 16,378
Disposal date HVAC subsidiary |  |  | Jun. 26, 2013 |
Net sales | 0 | 863 | 176 | 11,282
(Loss) gain on disposal of discontinued operations | 0 | (1,617) | (12) | 9,953
(Loss) income from discontinued operations | (111) | 1,574 | (178) | 1,729
(Loss) income from discontinued operations before income taxes | (111) | (43) | (190) | 11,682
Income tax expense | 0 | 42 | 292 | 2,398
(Loss) income from discontinued operations, net of tax | $ (111) | $ (85) | $ (482) | $ 9,284

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