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Convertible Senior Notes - Narrative (Detail) - USD ($) $ in Millions | Apr. 30, 2022 | Sep. 30, 2019 | Jun. 30, 2018
--- | --- | --- | ---
2024 Notes |  |  |
Debt Instrument |  |  |
Debt instrument, principal amount |  | $ 350 |
Private Offering | 2024 Notes |  |  |
Debt Instrument |  |  |
Debt instrument, principal amount |  | $ 350 |
Debt instrument, interest rate |  | 0.00% |
Private Offering | 2023 Notes |  |  |
Debt Instrument |  |  |
Debt instrument, principal amount | $ 335 |  | $ 300
Debt instrument, interest rate |  |  | 0.00%
Overallotment option | 2023 Notes |  |  |
Debt Instrument |  |  |
Debt instrument, principal amount |  |  | $ 35

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