COMMITMENTS - Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Operating leases, options to extend			true
Operating leases, options to terminate			true
Operating lease expense	$ 1,100	$ 500	$ 3,017	$ 1,318
Operating lease payments	$ 1,100	300	$ 3,000	1,200
Weighted average lease term	41 months		41 months
Weighted average discount rate	2.50%		2.50%
Future minimum lease payment			$ 2,400	2,300
Unsatisfied bonded performance obligations	$ 272,400		272,400
April 30, 2022	1,020		1,020
Bonds outstanding, covering other risks			$ 800
London Interbank Offered Rate (LIBOR)
Interest rate margin on referred rate			1.60%
TRC
April 30, 2022	300		$ 300
GPS | Financial guarantee
Guarantor obligation maximum exposure	3,600		3,600
Costs of Revenues
Rent expense	2,800	2,300	9,000	4,200
Selling, General and Administrative Expenses
Rent expense	$ 300	$ 200	$ 700	$ 700