COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS
Costs charged to uncompleted contracts	$ 888,854	$ 764,071
Estimated accrued earnings	175,760	116,326
Contracts Receivables, Gross	1,064,614	880,397
Less - billings to date	1,182,692	982,182
Billings in excess of costs and estimated earnings on uncompleted contracts, net	(118,078)	(101,785)
Costs and estimated earnings in excess of billings	3,052	4,078
Billings in excess of costs and estimated earnings	121,130	$ 105,863
Retention payable	$ 10,900