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REVENUES FROM CONTRACT WITH CUSTOMERS - Impact of the Adoption of the New Accounting Standard (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Feb. 01, 2018	Jan. 31, 2018
Impact of the Adoption of the New Accounting Standard
Accounts receivable, net	$ 43,612			$ 24,756
Contract assets	55,628			13,847
Contract liabilities	9,778			47,613
Deferred taxes	1,388			1,293
Retained earnings	253,716			211,150
Retained amounts by project owners	14,200			69,700
Change in contracts in progress, net	79,616	$ 94,629
Balances Reported Previously
Impact of the Adoption of the New Accounting Standard
Accounts receivable, net				94,440
Costs and estimated earnings in excess of billings				4,887
Billings in excess of costs and estimated earnings				108,388
Deferred taxes				1,279
Retained earnings				211,112
Impact of the Adoption of ASC Topic 606
Impact of the Adoption of the New Accounting Standard
Accounts receivable, net				(69,684)
Costs and estimated earnings in excess of billings				(4,887)
Contract assets				13,847
Billings in excess of costs and estimated earnings				(108,388)
Contract liabilities				47,613
Deferred taxes				13
Retained earnings				$ 38
Retained amounts by project owners	14,200
Capitalized project costs, net	300
Change in contracts in progress, net	79,600	94,600
Decline in the amounts of billings in excess of costs and estimated earnings	(93,100)	(62,400)
Increase in costs and estimated earnings in excess of billings	38,800	7,000
Increase (decrease) in customer retainages	55,500	$ 28,700
Revenues recognized that was included in contract liabilities	$ 45,600
Impact of the Adoption of ASC Topic 606 | Maximum
Impact of the Adoption of the New Accounting Standard
Retained earnings			$ 100

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- Definition

Liability attributable to (i) billings in excess of costs and estimated earnings 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 and estimated earnings incurred and accumulated under the completed contract accounting method.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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