Operating Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($) lease	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Number of operating lease options | lease	1
Operating lease, expense	$ 9.7
Weighted-average remaining lease term	7 years 6 months
Weighted-average discount rate	5.10%
Operating lease expense		$ 7.2
Rent expense			$ 3.3
Maximum
Lessee, Lease, Description [Line Items]
Lease contractual period	10 years