Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Convertible Senior Notes - Narrative (Detail) - USD ($) $ in Millions	Jul. 30, 2022	Apr. 30, 2022	Jan. 29, 2022	Sep. 30, 2019	Jun. 30, 2018
2023 Notes
Debt Instrument
Debt instrument, principal amount		$ 9.4
Private Offering
Debt Instrument
Debt instrument, principal amount					$ 300.0
Private Offering \| 2024 Notes
Debt Instrument
Debt instrument, principal amount	$ 350.0			$ 350.0
Debt instrument, interest rate				0.00%
Private Offering \| 2023 Notes
Debt Instrument
Debt instrument, principal amount			$ 335.0
Debt instrument, interest rate					0.00%
Overallotment option \| 2023 Notes
Debt Instrument
Debt outstanding					$ 35.0