Long-Term Borrowings - Additional Information (Details) - USD ($) $ in Thousands		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 05, 2020	Mar. 26, 2022	Jun. 25, 2022	Sep. 25, 2021
Debt Instrument [Line Items]
Ownership interest in Suburban Energy Finance Corp (in hundredths)			100.00%
Long-term borrowings			$ 1,091,400	$ 1,132,000
Consolidated fixed charge coverage ratio, minimum			1.75
Long-term debt maturities, 2022			$ 0
Long-term debt maturities, 2023			0
Long-term debt maturities, 2024			0
Long-term debt maturities, 2025			91,400
Long-term debt maturities, 2026			0
Long-term debt maturities, 2026 and thereafter			$ 1,000,000
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%
LIBOR [Member]
Debt Instrument [Line Items]
Description of applicable interest rate on borrowings			LIBOR
Margin over basis rate (in hundredths)			1.00%
Amended Credit Agreement Due 2025 [Member]
Debt Instrument [Line Items]
Weighted average interest rate (in hundredths)			4.62%
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)		0.005%
Amended Credit Agreement Due 2025 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Description of applicable interest rate on borrowings			LIBOR
Margin over basis rate (in hundredths)			1.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 05, 2025		Mar. 05, 2025
Long-term borrowings			$ 91,400	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			$ 48,862
Standby letters of credit issued under the Revolving Credit Facility, expiration date			Apr. 30, 2023
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member]
Debt Instrument [Line Items]
Long-term borrowings			$ 91,400	$ 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
5.0 % 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
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] | 5.0 % 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