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Costs, Estimated Earnings and Billings on Uncompleted Contracts (Details) (USD $) | Jan. 31, 2013 | Jan. 31, 2012
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Aggregate amounts of costs incurred and earnings accrued on uncompleted contracts compared with billings for contracts |  |
Costs incurred on uncompleted contracts | $ 259,390,000 | $ 106,379,000
Estimated accrued earnings | 48,724,000 | 12,121,000
Contracts Receivables, Gross | 308,114,000 | 118,500,000
Less - Billings to date | 380,295,000 | 183,723,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net | 72,181,000 | 65,223,000
Costs and estimated earnings in excess of billings | 1,178,000 | 2,781,000
Billings in excess of costs and estimated earnings | 73,359,000 | 68,004,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net | $ 72,181,000 | $ 65,223,000

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 45 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 45 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 + Details
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