Leases (Additional Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term (in years)	7 years 3 months 18 days	7 years 6 months
Weighted average discount rate (in percentage)	2.79%	3.41%
Operating lease minimum payments, executed leases that have not commenced	$ 16.9
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	1 year
Lease renewal term (in years)	1 year
Optional termination period (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	70 years
Lease renewal term (in years)	10 years
Optional termination period (in years)	10 years