REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Jan. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Contract Liabilities		$ 66.5	$ 50.9
Retained amounts by project owners	$ 24.8	$ 21.2
Amounts of unpriced change orders included in transaction prices	9.4	8.4
Kilroot Project | APC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Estimated loss	$ 12.7
Estimated loss, including reversal of net gross profit	$ 2.6