Long-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	May 27, 2014	Feb. 25, 2015	Sep. 27, 2014	Aug. 01, 2012	Aug. 06, 2013	Aug. 02, 2013
Debt Instrument [Line Items]
Long-term borrowings	$ 1,242,508		$ 1,242,508				$ 1,242,685
Ownership interest in Suburban Energy Finance Corp (in hundredths)	100.00%		100.00%
Loss on the extinguishment of debt	(15,072)	0	(15,072)	0
Revolving Credit Facility and Senior Notes covenants [Abstract]
Consolidated interest coverage ratio, minimum			2.0 to 1.0
Total consolidated leverage ratio, maximum			7.0 to 1.0
Consolidated interest coverage ratio commencing with second quarter of fiscal 2014, minimum			2.5 to 1.0
Consolidated fixed charge coverage ratio, minimum			1.75 to 1
Consolidated leverage ratio commencing with second quarter of fiscal 2013, minimum			4.75 to 1.0
Consolidated leverage ratio commencing with second quarter of fiscal 2013, during acquisition period, minimum			5.0 to 1.0
Margin over basis rate (in hundredths)			1.00%
Interest rate swap agreement [Abstract]
Notional Amount	100,000		100,000
Long-term debt maturities [Abstract]
Long-term debt maturities, 2015	0		0
Long-term debt maturities, 2016	0		0
Long-term debt maturities, 2017	100,000		100,000
Long-term debt maturities, 2018	0		0
Long-term debt maturities, 2019	0		0
Long-term debt maturities, 2020 and thereafter	1,121,180		1,121,180
Amended Credit Agreement Due 2017 [Member]
Revolving Credit Facility and Senior Notes covenants [Abstract]
Weighted average interest rate (in hundredths)	2.50%		2.50%
Interest rate swap agreement [Abstract]
Effective date			Jun. 25, 2013
Termination date			Jan. 05, 2017
Fixed interest rate (in hundredths)	1.63%		1.63%
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%
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%
7.5% Senior Notes due October 1, 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	7.50%		7.50%
Maturity date	Oct. 01, 2018
Date public offering completed	Aug. 01, 2012
Aggregate principal amount	496,557		496,557
Fair value of debt at acquisition date (in hundredths)								106.875%
Loss on the extinguishment of debt					11,589
Redemption premium and related fees					31,633
Write-off unamortized debt origination costs					5,230
Write-off unamortized premium					(25,274)
7.375% Senior Notes due March 15, 2020 [Member]
Debt Instrument [Line Items]
Long-term borrowings	0		0				248,817
Stated interest rate (in hundredths)	7.375%		7.375%
Maturity date	Mar. 15, 2020
Net unamortized discount	0		0				1,183
Date public offering completed	Mar. 23, 2010
Aggregate principal amount	250,000		250,000
Loss on the extinguishment of debt						15,072
Redemption premium and related fees						11,124
Write-off unamortized debt origination costs						2,855
Write-off unamortized premium						1,093
Percentage of principal amount at which debt was issued (in hundredths)	99.136%		99.136%
7.375% Senior Notes due August 1, 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	367,508		367,508				368,868
Stated interest rate (in hundredths)	7.375%		7.375%
Maturity date	Aug. 01, 2021
Net unamortized premium	21,328		21,328				22,688
Date public offering completed	Aug. 01, 2012
Aggregate principal amount	503,443		503,443
Fair value of debt at acquisition date (in hundredths)								108.125%
Debt instrument repurchase amount									23,863	133,400
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)	101.00%		101.00%
Number of days after the consummation of the change of control that a rating decline may occur to trigger offer to repurchase debt	90 days
5.5% Senior Notes due June 1, 2024 [Member]
Debt Instrument [Line Items]
Long-term borrowings	525,000		525,000				525,000
Stated interest rate (in hundredths)	5.50%		5.50%
Maturity date	Jun. 01, 2024
Date public offering completed	May 27, 2014
Aggregate principal amount	525,000		525,000
Percentage of principal amount at which debt was issued (in hundredths)	100.00%		100.00%
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)	101.00%		101.00%
Number of days after the consummation of the change of control that a rating decline may occur to trigger offer to repurchase debt	90 days
5.75% Senior Notes Due March 1, 2025 [Member]
Debt Instrument [Line Items]
Long-term borrowings	250,000		250,000				0
Stated interest rate (in hundredths)	5.75%		5.75%
Maturity date	Mar. 01, 2025
Date public offering completed	Feb. 25, 2015
Aggregate principal amount	250,000		250,000
Percentage of principal amount at which debt was issued (in hundredths)	100.00%		100.00%
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)	101.00%		101.00%
Number of days after the consummation of the change of control that a rating decline may occur to trigger offer to repurchase debt	90 days
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term borrowings	100,000		100,000				100,000
Maturity date	Jan. 05, 2017
Standby letters of credit issued under the Revolving Credit Facility	53,230		53,230
Available borrowing capacity under Revolving Credit Facility	246,770		246,770
Revolving Credit Facility [Member] | Amended Credit Agreement Due 2017 [Member]
Debt Instrument [Line Items]
Revolving credit facility, term	5 years
Credit Facility, maximum amount	$ 400,000		$ 400,000