Long-Term Borrowings - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 05, 2020	Dec. 30, 2023	Sep. 30, 2023	Dec. 28, 2022
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		$ 1,253,905	$ 1,198,766	$ 80,645
Consolidated fixed charge coverage ratio, minimum		1.75
Long-term debt maturities, 2024		$ 0
Long-term debt maturities, 2025		186,800
Long-term debt maturities, 2026		0
Long-term debt maturities, 2027		350,000
Long-term debt maturities, 2028		0
Long-term debt maturities, 2028 and thereafter		$ 730,645
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)		7.90%
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. 05, 2025	Mar. 05, 2025
Long-term borrowings		$ 186,800	132,000
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		$ 33,586
Standby letters of credit issued under the Revolving Credit Facility, expiration date		Nov. 01, 2024
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member]
Debt Instrument [Line Items]
Long-term borrowings		$ 186,800	$ 132,000
Credit Facility, maximum amount	$ 500,000
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%
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