REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2024	Jan. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract Liabilities		$ 95.5	$ 131.0
Retained amounts by project owners	$ 21.2	$ 21.2	$ 49.1
Amounts of unpriced change orders included in transaction prices	8.4	8.4	11.6
Kilroot Project | APC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated loss	$ 10.0
Estimated loss, including reversal of net gross profit		$ 13.6