Revenue and Contract Balances - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Disaggregation of Revenue [Line Items]
Unbilled receivables, current	$ 1,300,000		$ 1,300,000		$ 1,500,000
Contract with customer, liability	206,900,000		206,900,000		$ 141,800,000
Contract with customer, liability, revenue recognized	23,400,000	$ 13,500,000	77,000,000	$ 43,800,000
Deferred policy acquisition costs, impairment loss	$ 0	$ 0	$ 0	$ 0
Minimum
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, contract term			1 year
Maximum
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, contract term			3 years