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Long-Term Borrowings - Additional Information (Details)			3 Months Ended						12 Months Ended
Long-Term Borrowings - Additional Information (Details)	Feb. 14, 2017 USD ($)	Mar. 03, 2016 USD ($)	Dec. 29, 2018	Sep. 29, 2018 USD ($)	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Mar. 26, 2016 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 24, 2016 USD ($)
Debt Instrument [Line Items]
Ownership interest in Suburban Energy Finance Corp (in hundredths)				100.00%					100.00%
Loss on debt extinguishment									$ 0	$ 1,567,000	$ 292,000
Long-term borrowings				$ 1,255,138,000					$ 1,255,138,000	1,272,164,000
Notional Amount										100,000,000
Consolidated fixed charge coverage ratio, minimum									1.75
Long-term debt maturities, 2019				0					$ 0
Long-term debt maturities, 2020				0					0
Long-term debt maturities, 2021				143,600,000					143,600,000
Long-term debt maturities, 2022				0					0
Long-term debt maturities, 2023				0					0
Long-term debt maturities, thereafter				$ 1,125,000,000					$ 1,125,000,000
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 2021 [Member]
Debt Instrument [Line Items]
Consolidated interest coverage ratio, minimum				2.5
Total consolidated leverage ratio, maximum				5.75	5.95	5.95	5.95
Senior secured unconsolidated leverage ratio maximum				3.0
Weighted average interest rate (in hundredths)				4.60%					4.60%
Amended Credit Agreement Due 2021 [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%
Amended Credit Agreement Due 2021 [Member] \| 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 2021 [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Total consolidated leverage ratio, maximum			5.5
Amended Credit Agreement Due 2017 [Member]
Debt Instrument [Line Items]
Effective date									Jun. 25, 2013
Termination date									Jan. 05, 2017
Fixed interest rate (in hundredths)				1.63%					1.63%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date									Mar. 03, 2021
Long-term borrowings				$ 143,600,000					$ 143,600,000	162,645,000
Standby letters of credit issued under the Revolving Credit Facility				43,026,000					43,026,000
Revolving Credit Facility [Member] \| Amended Credit Agreement Due 2021 [Member]
Debt Instrument [Line Items]
Write-off unamortized debt origination costs								$ 292,000			292,000
Revolving credit facility, term		5 years
Credit Facility, maximum amount		$ 500,000,000
Capitalized costs											$ 2,678,000
Capitalized debt origination costs				$ 2,644,000					$ 2,644,000	$ 3,738,000
Senior Notes [Member] \| 5.5% Senior Notes due June 1, 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)				5.50%					5.50%	5.50%
Date public offering completed									May 27, 2014
Aggregate principal amount				$ 525,000,000					$ 525,000,000
Percentage of principal amount at which debt was issued (in hundredths)				100.00%					100.00%
Maturity date									Jun. 01, 2024
Redemption start date									Jun. 01, 2019
Redemption description									The 2024 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after June 1, 2019, in each case at the redemption prices described in the table below, together with any accrued and unpaid interest to the date of the redemption.
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)				101.00%					101.00%
Repurchase of debt due to decline in rating after consummation of change of control, period									90 days
Senior Notes [Member] \| 7.5% Senior Notes due October 1, 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)				7.50%					7.50%
Senior Notes [Member] \| 5.75% Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)				5.75%					5.75%	5.75%
Date public offering completed									Feb. 25, 2015
Aggregate principal amount				$ 250,000,000					$ 250,000,000
Percentage of principal amount at which debt was issued (in hundredths)				100.00%					100.00%
Maturity date									Mar. 01, 2025
Redemption start date									Mar. 01, 2020
Redemption description									The 2025 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after March 1, 2020, in each case at the redemption prices described in the table below, together with any accrued and unpaid interest to the date of the redemption.
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)				101.00%					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 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)				7.375%					7.375%
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%	5.875%
Date public offering completed									Feb. 14, 2017
Aggregate principal amount				$ 350,000,000					$ 350,000,000
Percentage of principal amount at which debt was issued (in hundredths)				100.00%					100.00%
Maturity date									Mar. 01, 2027
Redemption start date									Mar. 01, 2022
Redemption description									The 2027 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after March 1, 2022, in each case at the redemption prices described in the table below, together with any accrued and unpaid interest to the date of the redemption.
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)				101.00%					101.00%
Repurchase of debt due to decline in rating after consummation of change of control, period									90 days
Capitalized costs										$ 6,100,000
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%
Loss on debt extinguishment	$ 1,567,000
Redemption premium and related fees	15,078,000
Write-off unamortized debt origination costs	2,272,000									$ 1,567,000
Write-off unamortized premium	$ (15,783,000)