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.

No definition available.

Long-Term Borrowings - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 28, 2022 USD ($)	Jun. 27, 2026 USD ($)	Jun. 28, 2025 USD ($)	Jun. 27, 2026 USD ($)	Jun. 28, 2025 USD ($)	Sep. 27, 2025 USD ($)	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%		100.00%
Long-term borrowings	$ 80,645	$ 1,235,025		$ 1,235,025		$ 1,218,892
Loss on debt extinguishment		(0)	$ 0	$ (1,183)	$ 0
Consolidated fixed charge coverage ratio, minimum				1.75
Long-term debt maturities, 2026		0		$ 0
Long-term debt maturities, 2027		0		0
Long-term debt maturities, 2028		0		0
Long-term debt maturities, 2029		175,807		175,807
Long-term debt maturities, 2030		12,352		12,352
Long-term debt maturities, thereafter		$ 1,056,586		$ 1,056,586
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)		6.10%		6.10%
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		$ 164,100		$ 164,100		149,200
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		23,886		$ 23,886
Standby letters of credit issued under the Revolving Credit Facility, expiration date				Apr. 30, 2027
Revolving Credit Facility [Member] \| Third Amended and Restated Credit [Member]
Debt Instrument [Line Items]
Long-term borrowings						$ 149,200
Revolving Credit Facility [Member] \| Fourth Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date				Mar. 15, 2029
Long-term borrowings		$ 164,100		$ 164,100
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%		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%		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%		100.00%
Percentage of principal amount at which debt was issued (in hundredths)		100.00%		100.00%
Aggregate principal amount		$ 650,000		$ 650,000
6.50% Senior Notes due December 15, 2035 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		6.50%		6.50%		6.50%
Maturity date				Dec. 15, 2035		Dec. 15, 2035
Date public offering completed				Dec. 22, 2025
Ownership interest in Suburban Energy Finance Corp (in hundredths)		100.00%		100.00%
Percentage of principal amount at which debt was issued (in hundredths)		100.00%		100.00%
Aggregate principal amount		$ 350,000		$ 350,000
5.5% Senior Notes due June 1, 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.50%		5.50%
5.75% Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.75%		5.75%
Senior Notes [Member]
Debt Instrument [Line Items]
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)		101.00%		101.00%		101.00%
Repurchase of debt due to decline in rating after consummation of change of control, period				90 days		90 days
Loss on debt extinguishment				$ 1,183
Senior Notes [Member] \| 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
Date public offering completed				Feb. 14, 2017
Ownership interest in Suburban Energy Finance Corp (in hundredths)		100.00%		100.00%
Long-term borrowings		$ 0		$ 0		$ 350,000
Percentage of principal amount at which debt was issued (in hundredths)		100.00%		100.00%
Aggregate principal amount		$ 350,000		$ 350,000
Senior Notes [Member] \| 7.375% Senior Notes due August 1, 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		7.375%		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		650,000
Senior Notes [Member] \| 6.50% Senior Notes due December 15, 2035 [Member]
Debt Instrument [Line Items]
Long-term borrowings		$ 350,000		$ 350,000		$ 0
Senior notes redemption aggregate price				106.50%