COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS
Costs incurred on uncompleted contracts	$ 764,071,000	$ 324,839,000
Estimated accrued earnings	116,326,000	60,809,000
Contracts Receivables, Gross	880,397,000	385,648,000
Less - billings to date	982,182,000	546,757,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net	(101,785,000)	(161,109,000)
Costs and estimated earnings in excess of billings	4,078,000	455,000
Billings in excess of costs and estimated earnings	105,863,000	$ 161,564,000
Retention payable	$ 10,416,000
Period when most of retention payable is expected to be paid	1 year