Long-Term Borrowings - Additional Information (Details) - USD ($)			3 Months Ended	9 Months Ended
	Feb. 25, 2015	May. 27, 2014	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Sep. 27, 2014	Aug. 06, 2013	Aug. 02, 2013	Aug. 01, 2012
Debt Instrument [Line Items]
Ownership interest in Suburban Energy Finance Corp (in hundredths)				100.00%
Loss on debt extinguishment			$ 11,589,000	$ 15,072,000	$ 11,589,000
Long-term borrowings				$ 1,241,815,000		$ 1,242,685,000
Revolving Credit Facility and Senior Notes covenants [Abstract]
Consolidated interest coverage ratio, minimum				2.0
Total consolidated leverage ratio, maximum				7.0
Consolidated interest coverage ratio commencing with second quarter of fiscal 2014, minimum				2.5
Consolidated leverage ratio commencing with second quarter of fiscal 2013, minimum				4.75
Consolidated leverage ratio commencing with second quarter of fiscal 2013, during acquisition period, minimum				5.0
Margin over basis rate (in hundredths)				1.00%
Consolidated fixed charge coverage ratio, minimum				1.75
Interest rate swap agreement [Abstract]
Notional Amount				$ 100,000,000
Long-term debt maturities [Abstract]
Long-term debt maturities, remainder of the year				0
Long-term debt maturities, 2016				0
Long-term debt maturities, 2017				100,000,000
Long-term debt maturities, 2018				0
Long-term debt maturities, 2019				0
Long-term debt maturities, 2020 and thereafter				$ 1,121,180,000
Amended Credit Agreement Due 2017 [Member]
Revolving Credit Facility and Senior Notes covenants [Abstract]
Weighted average interest rate (in hundredths)				2.50%
Interest rate swap agreement [Abstract]
Effective date				Jun. 25, 2013
Termination date				Jan. 05, 2017
Fixed interest rate (in hundredths)				1.63%
Amended Credit Agreement Due 2017 [Member] | Federal Funds Rate [Member]
Revolving Credit Facility and Senior Notes covenants [Abstract]
Description of variable rate basis				Federal Funds Rate
Margin over basis rate (in hundredths)				0.50%
Amended Credit Agreement Due 2017 [Member] | LIBOR [Member]
Revolving Credit Facility and Senior Notes covenants [Abstract]
Description of variable rate basis				LIBOR
Margin over basis rate (in hundredths)				1.00%
7.5% Senior Notes due October 1, 2018 [Member]
Debt Instrument [Line Items]
Date public offering completed				Aug. 01, 2012
Aggregate principal amount				$ 496,557,000
Stated interest rate (in hundredths)				7.50%
Maturity date				Oct. 01, 2018
Fair value of debt at acquisition date (in hundredths)									106.875%
Loss on debt extinguishment		$ 11,589,000
Redemption premium and related fees		31,633,000
Write-off unamortized debt origination costs		5,230,000
Write-off unamortized premium		$ (25,274,000)
7.375% Senior Notes due August 1, 2021 [Member]
Debt Instrument [Line Items]
Date public offering completed				Aug. 01, 2012
Aggregate principal amount				$ 503,443,000
Stated interest rate (in hundredths)				7.375%		7.375%
Maturity date				Aug. 01, 2021
Fair value of debt at acquisition date (in hundredths)									108.125%
Debt instrument repurchase amount							$ 23,863,000	$ 133,400,000
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
Long-term borrowings				$ 366,815,000		$ 368,868,000
7.375% Senior Notes due March 15, 2020 [Member]
Debt Instrument [Line Items]
Date public offering completed				Mar. 23, 2010
Aggregate principal amount				$ 250,000,000
Stated interest rate (in hundredths)				7.375%
Maturity date				Mar. 15, 2020
Loss on debt extinguishment	$ 15,072,000
Redemption premium and related fees	11,124,000
Write-off unamortized debt origination costs	2,855,000
Percentage of principal amount at which debt was issued (in hundredths)				99.136%
Write-off unamortized discount	$ 1,093,000
Long-term borrowings						$ 248,817,000
5.5% Senior Notes due June 1, 2024 [Member]
Debt Instrument [Line Items]
Date public offering completed				May 27, 2014
Aggregate principal amount				$ 525,000,000
Stated interest rate (in hundredths)				5.50%		5.50%
Maturity date				Jun. 01, 2024
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
Long-term borrowings				$ 525,000,000		$ 525,000,000
5.75% Senior Notes Due March 1, 2025 [Member]
Debt Instrument [Line Items]
Date public offering completed				Feb. 25, 2015
Aggregate principal amount				$ 250,000,000
Stated interest rate (in hundredths)				5.75%
Maturity date				Mar. 01, 2025
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
Long-term borrowings				$ 250,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date				Jan. 05, 2017
Long-term borrowings				$ 100,000,000		$ 100,000,000
Standby letters of credit issued under the Revolving Credit Facility				53,230,000
Available borrowing capacity under Revolving Credit Facility				246,770,000
Revolving Credit Facility [Member] | Amended Credit Agreement Due 2017 [Member]
Debt Instrument [Line Items]
Credit Facility, maximum amount				$ 400,000,000
Revolving credit facility, term				5 years