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COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS
Costs charged to uncompleted contracts	$ 1,184,891	$ 485,629
Estimated accrued earnings	176,171	78,708
Contracts Receivables, Gross	1,361,062	564,337
Less - billings to date	1,464,563	770,386
Billings in excess of costs and estimated earnings on uncompleted long-term contracts, net	(103,501)	(206,049)
Costs and estimated earnings in excess of billings	4,887	3,192
Billings in excess of costs and estimated earnings	108,388	209,241
Retention payable	$ 38,700	$ 17,200

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