Revenue and Contract Balances - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Disaggregation of Revenue [Line Items]
Unbilled receivables, current	$ 1,400,000		$ 1,400,000		$ 1,500,000
Contract with customer, liability	184,600,000		184,600,000		$ 141,800,000
Contract with customer, liability, revenue recognized	24,500,000	$ 14,400,000	53,600,000	$ 30,200,000
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