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COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
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COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS |  |
Costs charged to uncompleted contracts | $ 485,629 | $ 764,071
Estimated accrued earnings | 78,708 | 116,326
Contracts Receivables, Gross | 564,337 | 880,397
Less - billings to date | 770,386 | 982,182
Costs and estimated earnings in excess of billings | 3,192 | 4,078
Billings in excess of costs and estimated earnings | 209,241 | 105,863
Billings in excess of costs and estimated earnings on uncompleted contracts, net | (206,049) | $ (101,785)
Retention payable | $ 17,200 |

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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 FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57807-111642 Reference 2: 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=68068069&loc=d3e57788-111642 Reference 3: 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=68068069&loc=d3e57795-111642 + Details
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