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Business and segment information Segment reporting (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 31, 2014 Segments | Jan. 31, 2013
Segment information [Line Items] |  |
Entity Incorporation, Date of Incorporation | Oct. 12, 1993 |
Number of reportable segments | 2 |
Customer concentration risk, percentage | 24.50% |
Net sales | $ 226,835 | $ 168,807
Gross profit | 52,215 | 27,494
Income (loss) from operations | 13,083 | (8,820)
Total assets | 163,269 | 149,488
Capital expenditures | 2,761 | 5,360
Depreciation and amortization expense | 5,785 | 5,806
Interest expense, net | 1,311 | 1,498
Piping Systems [Member] |  |
Segment information [Line Items] |  |
Net sales | 158,422 | 89,664
Gross profit | 43,273 | 17,020
Income (loss) from operations | 24,213 | 3,452
Total assets | 109,154 | 83,944
Capital expenditures | 2,425 | 4,206
Depreciation and amortization expense | 3,489 | 3,344
Interest expense, net | (495) | (226)
Filtration Products [Member] |  |
Segment information [Line Items] |  |
Net sales | 68,413 | 79,143
Gross profit | 8,942 | 10,474
Income (loss) from operations | (1,629) | (2,962)
Total assets | 41,765 | 52,958
Capital expenditures | 294 | 995
Depreciation and amortization expense | 1,729 | 1,750
Interest expense, net | (1,966) | (2,239)
Asset Impairment Charges | 0 | 1,520
Corporate and Other [Member] |  |
Segment information [Line Items] |  |
Income (loss) from operations | (9,501) | (9,310)
Total assets | 12,350 | 12,586
Capital expenditures | 42 | 159
Depreciation and amortization expense | 567 | 712
Interest expense, net | $ 1,150 | $ 967
Sales Revenue, Net [Member] |  |
Segment information [Line Items] |  |
Customer concentration risk, percentage | 10.60% | 10.00%

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