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v3.23.3

Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | May 31, 2023 | Mar. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs | $ 496,300,000 |  |  |  |  |  |
Long-term debt, current maturities |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
4.95% Senior Notes due 2033 (issued: $500.0, May 2023) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 500,000,000 |
Debt, stated interest rate |  |  |  |  |  | 4.95% |
Discretionary Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 300,000,000 | 300,000,000 |  |  |  | $ 250,000,000
Discretionary line of credit repayment period |  | 30 days |  |  |  |  |
Borrowings outstanding |  |  | $ 0 | $ 0 | $ 0 |  |
Discretionary Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.10% |  |  |  |  |

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