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Business segment reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 Segments | Oct. 31, 2012
Segment reporting |  |  |  |
Number of reportable segments |  |  | 2 |
Net sales | $ 57,967 | $ 47,236 | $ 173,460 | $ 132,137
Gross profit | 16,887 | 8,676 | 43,037 | 22,607
Income (loss) from operations | 6,380 | 185 | 14,093 | (2,837)
Piping Systems [Member] |  |  |  |
Segment reporting |  |  |  |
Net sales | 42,289 | 26,498 | 121,825 | 69,147
Gross profit | 14,726 | 6,060 | 35,760 | 14,327
Income (loss) from operations | 9,403 | 2,585 | 21,276 | 4,184
Filtration Products [Member] |  |  |  |
Segment reporting |  |  |  |
Net sales | 15,678 | 20,738 | 51,635 | 62,990
Gross profit | 2,161 | 2,616 | 7,277 | 8,280
Income (loss) from operations | (486) | (410) | (468) | (505)
Corporate Segment [Member] |  |  |  |
Segment reporting |  |  |  |
Income (loss) from operations | $ (2,537) | $ (1,990) | $ (6,715) | $ (6,516)

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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