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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended
	Jul. 26, 2021	Jan. 31, 2021	Apr. 30, 2022	Jan. 31, 2022
Derivative [Line Items]
Certificates of deposit			$ 90.0	$ 170.0
November 2017 Facility \| Secured Debt \| Wells Fargo Bank
Derivative [Line Items]
Debt instrument maturity date	Jul. 26, 2024
November 2017 Facility \| Revolving Credit Facility \| Secured Debt \| Wells Fargo Bank
Derivative [Line Items]
Total debt outstanding with carrying amount			30.0	30.0
0.00% Convertible Notes Due 2026 \| Senior Notes
Derivative [Line Items]
Debt instrument interest rate stated percentage		0.00%
Debt instrument maturity date		Jan. 15, 2026
Aggregate principal amount		$ 345.0
0.00% Convertible Notes Due 2026 \| Senior Notes \| Level 2
Derivative [Line Items]
Convertible senior notes, fair value			$ 458.6	$ 413.1