Increase to maximum ratio of indebtedness to EBITDA.

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The interest coverage ratio.

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

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Represents the number of quarters included in the interest margin period.

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Ratio of debt to EBITDA.

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No definition available.

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

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No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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No definition available.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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No definition available.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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No definition available.

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Debt - Debt Narrative (Details)				12 Months Ended
Debt - Debt Narrative (Details)	Sep. 30, 2023 USD ($)	May 30, 2023	Sep. 14, 2021 USD ($) qtr	Dec. 31, 2023 USD ($)	Dec. 25, 2022 USD ($)	Sep. 30, 2015 USD ($)
Line of Credit Facility [Line Items]
Outstanding debt				$ 764,000,000	$ 605,000,000
Revolving facilities
Line of Credit Facility [Line Items]
Outstanding debt				$ 364,000,000	205,000,000
Senior notes
Line of Credit Facility [Line Items]
Face amount			$ 400,000,000
Interest rate			3.875%	3.875%
Unamortized debt issuance costs			$ 7,100,000
Outstanding debt				$ 400,000,000	400,000,000
Senior notes \| Redemption up to 40% at any time prior to September 15, 2024 with net cash proceeds from certain equity offerings
Line of Credit Facility [Line Items]
Redemption price percentage			103.875%
Senior notes \| Redemption at any time prior to September 15, 2024
Line of Credit Facility [Line Items]
Redemption price percentage			100.00%
Senior notes \| Minimum \| Redemption at any time on or after September 15, 2024
Line of Credit Facility [Line Items]
Redemption price percentage			0.97%
Senior notes \| Maximum \| Redemption at any time on or after September 15, 2024
Line of Credit Facility [Line Items]
Redemption price percentage			1.94%
Senior notes \| Maximum \| Redemption up to 40% at any time prior to September 15, 2024 with net cash proceeds from certain equity offerings
Line of Credit Facility [Line Items]
Redemption percentage			40.00%
PJI Facilities
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 600,000,000
Debt issuance costs			$ 2,100,000
Line of credit facility, remaining availability				236,000,000
Additional amount that company has option to increase borrowing capacity				500,000,000
Number of quarters in interest margin period \| qtr			4
PJI Facilities \| SOFR
Line of Credit Facility [Line Items]
Interest margin rate on debt		0.10%	1.00%
PJI Facilities \| Federal funds rate
Line of Credit Facility [Line Items]
Interest margin rate on debt			0.50%
PJI Facilities \| Swingline loan
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 40,000,000
PJI Facilities \| Letter of credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 80,000,000
PJI Facilities \| Revolving facilities
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 50,000,000
PJI Facilities \| Minimum
Line of Credit Facility [Line Items]
Percentage of commitment fee on unused credit facility			0.18%
PJI Facilities \| Minimum \| SOFR
Line of Credit Facility [Line Items]
Interest margin rate on debt			1.25%
PJI Facilities \| Minimum \| Base rate
Line of Credit Facility [Line Items]
Interest margin rate on debt			0.25%
PJI Facilities \| Maximum
Line of Credit Facility [Line Items]
Percentage of commitment fee on unused credit facility			0.30%
PJI Facilities \| Maximum \| SOFR
Line of Credit Facility [Line Items]
Interest margin rate on debt			2.00%
PJI Facilities \| Maximum \| Base rate
Line of Credit Facility [Line Items]
Interest margin rate on debt			1.00%
Amendment to Credit Agreement \| Minimum
Line of Credit Facility [Line Items]
Interest coverage ratio			2.00
Amendment to Credit Agreement \| Maximum
Line of Credit Facility [Line Items]
Leverage Ratio			5.25
Increase to leverage ratio			0.50
PJMF Revolving Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 30,000,000					$ 20,000,000
Outstanding debt					$ 0
PJMF Revolving Facility \| One-month SOFR
Line of Credit Facility [Line Items]
Interest margin rate on debt	1.975%