COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS - Aggregate Amount of Costs Incurred and Earnings Accrued on Uncompleted Contracts Compared with Billings on Contracts (Details) - USD ($)	Jul. 31, 2015	Jan. 31, 2015
COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS
Costs incurred on uncompleted contracts	$ 481,168,000	$ 324,839,000
Estimated accrued earnings	101,477,000	60,809,000
Contracts Receivables, Gross	582,645,000	385,648,000
Less - billings to date	694,289,000	546,757,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net	(111,644,000)	(161,109,000)
Costs and estimated earnings in excess of billings	2,943,000	455,000
Less - Billings in excess of costs and estimated earnings	$ 114,587,000	$ 161,564,000