CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (USD $) In Thousands, except Share data	Common Unitholders [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Sep. 24, 2011	$ 418,134	$ (59,916)	$ 358,218
Balance (in units) at Sep. 24, 2011	35,429,000
Net income	638		638
Net unrealized gains (losses) on cash flow hedges		(3,561)	(3,561)
Reclassification of realized losses on cash flow hedges into earnings		2,680	2,680
Amortization of net actuarial losses and prior service credits into earnings and net change in funded status of benefit plans		(310)	(310)
Partnership distributions	(121,094)		(121,094)
Issuance of Common Units for business acquisition (in units)	14,200,000
Issuance of Common Units for business acquisition	590,027		590,027
Sale of Common Units under public offering, net of offering expenses	259,842		259,842
Sale of Common Units under public offering, net of offering expenses (in units)	7,245,000
Common Units issued under Restricted Unit Plans (in units)	139,000
Compensation cost recognized under Restricted Unit Plans, net of forfeitures	4,059		4,059
Balance at Sep. 29, 2012	1,151,606	(61,107)	1,090,499
Balance (in units) at Sep. 29, 2012	57,013,000
Net income	78,798		78,798
Net unrealized gains (losses) on cash flow hedges		584	584
Reclassification of realized losses on cash flow hedges into earnings		2,465	2,465
Amortization of net actuarial losses and prior service credits into earnings and net change in funded status of benefit plans		10,705	10,705
Partnership distributions	(201,257)		(201,257)
Sale of Common Units under public offering, net of offering expenses	143,444		143,444
Sale of Common Units under public offering, net of offering expenses (in units)	3,105,000
Common Units issued under Restricted Unit Plans (in units)	113,000
Compensation cost recognized under Restricted Unit Plans, net of forfeitures	3,888		3,888
Balance at Sep. 28, 2013	1,176,479	(47,353)	1,129,126
Balance (in units) at Sep. 28, 2013	60,231,000
Net income	94,509		94,509
Net unrealized gains (losses) on cash flow hedges		(518)	(518)
Reclassification of realized losses on cash flow hedges into earnings		1,406	1,406
Amortization of net actuarial losses and prior service credits into earnings and net change in funded status of benefit plans		560	560
Partnership distributions	(211,020)		(211,020)
Common Units issued under Restricted Unit Plans (in units)	86,000
Compensation cost recognized under Restricted Unit Plans, net of forfeitures	7,390		7,390
Balance at Sep. 27, 2014	$ 1,067,358	$ (45,905)	$ 1,021,453
Balance (in units) at Sep. 27, 2014	60,317,000