COMMITMENTS - Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Operating leases, options to extend	true
Operating leases, options to terminate	true
Operating lease expense	$ 776	$ 379
Operating lease payments	$ 800	400
Weighted average lease term	32 months
Weighted average discount rate	3.00%
Future minimum lease payment	$ 500	400
Unsatisfied bonded performance obligations	372,000
Bonds outstanding, covering other risks	6,600
Warranty bond	$ 4,200
London Interbank Offered Rate (LIBOR)
Interest rate margin on referred rate	2.00%
TRC
April 30, 2022	$ 300
GPS | Financial guarantee
Guarantor obligation maximum exposure	3,600
Costs of Revenues
Rent expense	3,000	600
Selling, General and Administrative Expenses
Rent expense	$ 200	$ 200