Debt - Revolving Credit Facility (Details) - Revolving Credit Facility	1 Months Ended	12 Months Ended
	Aug. 31, 2020 USD ($)	Jan. 31, 2021 USD ($) financial_ratio
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Senior secured credit facility, maximum borrowing capacity	$ 300,000,000.0
Credit facility, maturity period prior to stated maturity if out of compliance with liquidity threshold	91 days
Credit facility, daily minimum sum of cash and cash equivalents and aggregate unused commitments to prevent maturity prior to stated maturity	$ 625,000,000.0
Credit facility, amount borrowed		$ 250,000,000.0
Interest expense		$ 1,400,000
Number of financial ratios | financial_ratio		2
Maximum consolidation leverage ratio		4.5
Minimum interest coverage ratio		3
London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate during the period (percent)		1.65%
London Interbank Offered Rate (LIBOR) | Interest Rate Floor
Line of Credit Facility [Line Items]
Effective interest rate (percent)	0.00%
Minimum
Line of Credit Facility [Line Items]
Commitment fee (percent)	0.25%
Minimum | Base Rate
Line of Credit Facility [Line Items]
Margin rate (percent)	0.50%
Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Margin rate (percent)	1.50%
Maximum
Line of Credit Facility [Line Items]
Commitment fee (percent)	0.40%
Maximum | Base Rate
Line of Credit Facility [Line Items]
Margin rate (percent)	1.25%
Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Margin rate (percent)	2.25%