Long-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended								3 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended					12 Months Ended		0 Months Ended		12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012	Sep. 27, 2014 LIBOR [Member]	Sep. 27, 2014 Federal Funds Rate [Member]	Sep. 27, 2014 Amended Credit Agreement Due 2017 [Member]	Sep. 27, 2014 Amended Credit Agreement Due 2017 [Member] LIBOR [Member]	Sep. 27, 2014 Amended Credit Agreement Due 2017 [Member] Federal Funds Rate [Member]	Mar. 29, 2014 Revolving Credit Facility [Member]	Sep. 27, 2014 Revolving Credit Facility [Member]	Sep. 28, 2013 Revolving Credit Facility [Member]	May 27, 2014 7.5% Senior Notes due October 1, 2018 [Member]	Sep. 27, 2014 7.5% Senior Notes due October 1, 2018 [Member]	Sep. 28, 2013 7.5% Senior Notes due October 1, 2018 [Member]	Aug. 01, 2012 7.5% Senior Notes due October 1, 2018 [Member]	Sep. 27, 2014 7.375% Senior Notes due March 15, 2020 [Member]	Sep. 28, 2013 7.375% Senior Notes due March 15, 2020 [Member]	Sep. 27, 2014 7.375% Senior Notes due August 1, 2021 [Member]	Sep. 28, 2013 7.375% Senior Notes due August 1, 2021 [Member]	Aug. 06, 2013 7.375% Senior Notes due August 1, 2021 [Member]	Aug. 02, 2013 7.375% Senior Notes due August 1, 2021 [Member]	Aug. 01, 2012 7.375% Senior Notes due August 1, 2021 [Member]	Sep. 27, 2014 5.5% Senior Notes due June 1, 2024 [Member]	Sep. 28, 2013 5.5% Senior Notes due June 1, 2024 [Member]	Aug. 14, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member]	Aug. 01, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member]	Sep. 27, 2014 Amended Credit Agreement [Member] Revolving Credit Facility [Member]	Aug. 01, 2012 Amended Credit Agreement [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 1,242,685	$ 1,245,237								$ 100,000	$ 100,000		$ 0	$ 525,171		$ 248,817	$ 248,600	$ 368,868	$ 371,466				$ 525,000	$ 0
Stated interest rate (in hundredths)													7.50%			7.375%		7.375%					5.50%
Maturity date										Jan. 05, 2017			Oct. 01, 2018			Mar. 15, 2020		Aug. 01, 2021					Jun. 01, 2024
Ownership interest in Suburban Energy Finance Corp (in hundredths)	100.00%
Net unamortized premium													0	28,614				22,688	25,286
Net unamortized discount																1,183	1,400
Date public offering completed													Aug. 01, 2012			Mar. 23, 2010		Aug. 01, 2012					May 27, 2014
Aggregate principal amount													496,557			250,000		503,443					525,000
Debt instrument repurchase amount																			157,263	23,863	133,400
Loss on debt extinguishment	(11,589)	(2,144)	(2,249)									11,589							2,144
Redemption premium and related fees												31,633							11,759
Write-off unamortized debt origination costs												5,230							2,064
Write-off unamortized premium												(25,274)							(11,678)
Fair value of debt at acquisition date (in hundredths)															106.875%							108.125%
Percentage of principal amount at which debt was issued (in hundredths)																99.136%							100.00%
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)																101.00%		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		90 days					90 days
Revolving credit facility, term																											5 years
Credit Facility, maximum amount																										250,000	400,000	400,000
Amount drawn under credit facility																										225,000
Term of facility																										364 days
Repayments of short-term borrowings	61,700	0	0																						225,000
Standby letters of credit issued under the Revolving Credit Facility										44,882
Available borrowing capacity under Revolving Credit Facility										255,118
Credit facility borrowings	100,000								55,000
Senior Notes [Abstract]
2015																103.688%
2016																102.458%		103.688%
2017																101.229%		102.459%
2018																		101.229%
2018 and thereafter																100.00%
2019 and thereafter																		100.00%
2019																							102.75%
2020																							101.833%
2021																							100.917%
2022 and thereafter																							100.00%
Revolving Credit Facility and 2020 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	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
Description of variable rate basis				LIBOR	Federal Funds Rate		LIBOR	Federal Funds Rate
Margin over basis rate (in hundredths)	1.00%			1.00%	0.50%		1.00%	0.50%
Weighted average interest rate (in hundredths)						2.50%
Interest rate swap agreement [Abstract]
Notional Amount	100,000
Effective date	Mar. 31, 2010					Jun. 25, 2013
Termination date	Jun. 25, 2013					Jan. 05, 2017
Fixed interest rate (in hundredths)	3.12%					1.63%
Debt origination costs [Abstract]
Capitalized debt origination costs	21,023	21,254
Long-term debt maturities [Abstract]
Long-term debt maturities, 2015	0
Long-term debt maturities, 2016	0
Long-term debt maturities, 2017	100,000
Long-term debt maturities, 2018	0
Long-term debt maturities, 2019	0
Long-term debt maturities, 2020 and thereafter	$ 1,121,180