REVENUES FROM CONTRACT WITH CUSTOMERS - Accounting for the Loss Subcontract (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020	Mar. 24, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Provision for contract loss					$ 5.8
TeesREPProject
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Loss recorded		$ 0.3		$ 31.2
Reversal of profit				$ 0.7
Percentage of completion of subcontracted work						90.00%
Reduction to the subcontract loss	$ (2.8)		$ (4.1)
Subcontract loss			(29.5)
The total amounts of accounts receivable and contract assets with the customer			$ 7.3		$ 19.2