Leases - Other information (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Leases [Abstract]
Operating lease, lease not yet commenced, description	As of July 31, 2021, there
Weighted average remaining lease term	5 years 6 months
Weighted average discount rate	8.40%
Cash paid for amounts included in the measurement of operating lease liabilities	$ 29.4	$ 51.0
Right-of-use assets obtained in exchange for lease obligations	$ 8.6	$ 10.8