Leases (Additional Information) (Details) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($)
Weighted average remaining lease term (in years)	7 years 6 months
Weighted average discount rate (in percentage)	3.41%
Operating lease minimum payments, executed leases that have not commenced	$ 22.7
Minimum
Remaining lease term (in years)	1 year
Lease renewal term (in years)	1 year
Optional termination period (in years)	1 year
Maximum
Remaining lease term (in years)	70 years
Lease renewal term (in years)	10 years
Optional termination period (in years)	10 years