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Long-Term Borrowings - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 28, 2022 USD ($)	Dec. 28, 2024 USD ($)	Sep. 28, 2024 USD ($)	Mar. 15, 2024 USD ($)
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	5.50%
Ownership interest in Suburban Energy Finance Corp (in hundredths)		100.00%
Long-term borrowings	$ 80,645	$ 1,311,236	$ 1,219,167
Consolidated fixed charge coverage ratio, minimum		1.75
Long-term debt maturities, 2025		$ 0
Long-term debt maturities, 2026		0
Long-term debt maturities, 2027		592,700
Long-term debt maturities, 2028		0
Long-term debt maturities, 2029		11,707
Long-term debt maturities, 2029 and thereafter		$ 718,938
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Description of applicable interest rate on borrowings		Federal Funds Rate
Margin over basis rate (in hundredths)		0.50%
Amended Credit Agreement Due 2025 [Member]
Debt Instrument [Line Items]
Margin over basis rate (in hundredths)		1.00%
Weighted average interest rate (in hundredths)		7.04%
Amended Credit Agreement Due 2025 [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Description of applicable interest rate on borrowings		Federal Funds Rate
Margin over basis rate (in hundredths)		0.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date		Mar. 15, 2029
Long-term borrowings		$ 242,700	151,000
Consolidated interest coverage ratio, minimum		2.5
Total consolidated leverage ratio		5.75
Senior secured unconsolidated leverage ratio maximum		3.25
Standby letters of credit issued under the Revolving Credit Facility		$ 26,387
Standby letters of credit issued under the Revolving Credit Facility, expiration date		Nov. 21, 2025
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member]
Debt Instrument [Line Items]
Long-term borrowings			$ 151,000
Revolving Credit Facility [Member] | Fourth Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date		Mar. 15, 2029
Long-term borrowings		$ 242,700
Credit Facility, maximum amount				$ 500,000
Green Bonds [Member]
Debt Instrument [Line Items]
Debt Service Coverage Ratio Minimum	1
5.875% Senior Notes due March 1, 2027 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.875%	5.875%
Maturity date		Mar. 01, 2027	Mar. 01, 2027
5.00% Senior Notes due June 1, 2031 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.00%	5.00%
Maturity date		Jun. 01, 2031	Jun. 01, 2031
Date public offering completed		May 24, 2021
Ownership interest in Suburban Energy Finance Corp (in hundredths)		100.00%
Percentage of principal amount at which debt was issued (in hundredths)		100.00%
Aggregate principal amount		$ 650,000
5.5% Senior Notes due June 1, 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.50%
5.75% Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.75%
Senior Notes [Member] | 5.875% Senior Notes due March 1, 2027 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.875%
Maturity date		Mar. 01, 2027
Date public offering completed		Feb. 14, 2017
Ownership interest in Suburban Energy Finance Corp (in hundredths)		100.00%
Long-term borrowings		$ 350,000	$ 350,000
Percentage of principal amount at which debt was issued (in hundredths)		100.00%
Aggregate principal amount		$ 350,000
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)		101.00%
Repurchase of debt due to decline in rating after consummation of change of control, period		90 days
Senior Notes [Member] | 7.375% Senior Notes due August 1, 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		7.375%
Senior Notes [Member] | 5.00% Senior Notes due June 1, 2031 [Member]
Debt Instrument [Line Items]
Long-term borrowings		$ 650,000	$ 650,000
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)		101.00%
Repurchase of debt due to decline in rating after consummation of change of control, period		90 days

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- Definition

The indenture governing the 2020 Senior Notes, requires the Partnership's consolidated fixed charge coverage ratio, as defined, to exceed a minimum ratio to permit the Partnership to make cash distributions equal to available cash, as defined, as of the end of the immediately preceding quarter, if no event of default exists or would exist upon making such distributions.

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