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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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