Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands		Mar. 26, 2016	Sep. 26, 2015
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		$ 533,066	$ 505,093
Accumulated amortization		(225,651)	(197,304)
Other intangible assets, net		307,415	307,789
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1]	496,577	471,829
Accumulated amortization		(200,292)	(173,823)
Non-compete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1]	31,040	27,815
Accumulated amortization		(20,921)	(19,337)
Tradenames [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		3,482	3,482
Accumulated amortization		(3,317)	(3,069)
Other [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		1,967	1,967
Accumulated amortization		$ (1,121)	$ (1,075)

[1] Increases reflect the Propane USA acquisition (Note 3)