COMMITMENTS - Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Lease, practical expedients			true
Operating leases, options to extend			true
Operating leases, options to terminate			true
Operating lease expense			$ 0.3
Weighted average lease term	42 months		42 months
Weighted average discount rate	4.50%		4.50%
Costs of Revenues
Rent expense	$ 1.3		$ 2.3
Rent expense		$ 3.4		$ 8.2
Selling, General and Administrative Expenses
Rent expense	$ 0.2	$ 0.1	$ 0.4	$ 0.3