COMMITMENTS - Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Operating leases, options to extend			true
Operating leases, options to terminate			true
Operating lease expense	$ 500	$ 1,100	$ 1,319	$ 1,938
Operating lease payments	$ 500	1,100	$ 1,300	1,900
Weighted average lease term	60 months		60 months
Weighted average discount rate	2.40%		2.40%
Future minimum lease payment			$ 500	800
Unsatisfied bonded performance obligations	$ 139,600		139,600
Annual rental rate	540		540
Rent expense	3,000	$ 2,500	5,300	$ 4,900
Bonds outstanding, covering other risks			$ 1,000
London Interbank Offered Rate (LIBOR)
Interest rate margin on referred rate			1.60%
TRC
Annual rental rate	500		$ 500
GPS | Financial guarantee
Guarantor obligation maximum exposure	$ 3,600		$ 3,600