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Business and segment information Geographic information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Geographic information [Line Items] |  |
foreign sales | 0.00% | 0.00%
Net sales | $ 212,018 | $ 233,496
Property, plant and equipment, net of accumulated depreciation | 46,401 | 47,842
UNITED STATES |  |
Geographic information [Line Items] |  |
Net sales | 142,454 | 163,104
Property, plant and equipment, net of accumulated depreciation | 27,151 | 30,366
Middle East [Member] |  |
Geographic information [Line Items] |  |
Net sales | 24,631 | 12,721
Property, plant and equipment, net of accumulated depreciation | 13,204 | 11,417
Europe [Member] |  |
Geographic information [Line Items] |  |
Net sales | 19,386 | 20,815
Property, plant and equipment, net of accumulated depreciation | 5,065 | 4,623
Canada |  |
Geographic information [Line Items] |  |
Net sales | 11,183 | 6,894
India |  |
Geographic information [Line Items] |  |
Net sales | 6,318 | 2,259
Property, plant and equipment, net of accumulated depreciation | 981 | 1,436
Other Americas [Member] |  |
Geographic information [Line Items] |  |
Net sales | 3,053 | 22,370
India |  |
Geographic information [Line Items] |  |
Net sales | $ 4,993 | $ 5,333

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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- 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=6880815&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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