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Debt and Credit Facilities - Narrative (Details) - USD ($)						3 Months Ended		9 Months Ended
	Oct. 28, 2024	Oct. 25, 2024	Aug. 12, 2024	Apr. 30, 2024	Jun. 23, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 08, 2023
Line of Credit Facility [Line Items]
Line of credit facility, outstanding						$ 746,786,000		$ 746,786,000
Interest expense						5,351,000	$ 5,288,000	17,090,000	$ 16,007,000
Unsecured Debt | Facility
Line of Credit Facility [Line Items]
Face amount					$ 150,000,000
Increase in interest rate in event of default					2.00%
Amortization of debt issuance costs						100,000	$ 100,000	100,000	$ 100,000
Line of Credit | Uncommitted Secured Letter Of Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity										$ 200,000,000
Line of Credit | Unsecured Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity					$ 415,000,000
Line of credit facility, outstanding						$ 0		$ 0
Unused commitment fee percentage				0.175%	0.225%
Line of Credit | Unsecured Facility | Letter of Credit
Line of Credit Facility [Line Items]
Stated interest rate				1.375%	1.50%
Line of Credit | Unsecured Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity					$ 150,000,000
Basis spread on variable rate				1.625%	1.85%
Line of Credit | Bank of Montreal, Letter of Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 50,000,000
Unused commitment fee percentage			0.15%
Commitment fee percentage			0.40%
Line of Credit | UBS Letter of Credit Facility | Letter of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 100,000,000
Commitment fee percentage		1.40%
Line of Credit | Unsecured Facility, Lloyd's | Letter of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 230,000,000
Commitment fee percentage	1.625%
Term of debt agreement	1 year

X

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Debt Instrument, Interest Rate, Increase (Decrease), In Event Of Default

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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