Convertible Senior Notes - Outstanding Balances under 2023 Notes and 2024 Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2022	Jan. 29, 2022
Debt Instrument
Current portion of debt	$ 3,875	$ 13,625
Non-current portion of debt		1,129
Convertible senior notes
Debt Instrument
Principal amount	100,658	294,028
Unamortized Debt Issuance Cost	(612)	(37,576)
Long-term Debt, Total	100,046	256,452
2023 Notes
Debt Instrument
Principal amount	20,000
Current portion of debt		9,400
Non-current portion of debt		59,000
2023 Notes \| ASU 2020-06 \| Impact of adoption, adjustment
Debt Instrument
Equity component that was recombined upon the adoption of ASU 2020-06	5,700
2023 Notes \| Convertible senior notes
Debt Instrument
Principal amount	19,778	74,390
Unamortized Debt Issuance Cost	(120)	(5,999)
Long-term Debt, Total	19,658	68,391
2024 Notes
Debt Instrument
Principal amount	81,000
Current portion of debt		3,600
Non-current portion of debt		184,000
2024 Notes \| ASU 2020-06 \| Impact of adoption, adjustment
Debt Instrument
Equity component that was recombined upon the adoption of ASU 2020-06	30,000
2024 Notes \| Convertible senior notes
Debt Instrument
Principal amount	80,880	219,638
Unamortized Debt Issuance Cost	(492)	(31,577)
Long-term Debt, Total	$ 80,388	$ 188,061

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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