Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands		Dec. 30, 2017	Sep. 30, 2017
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		$ 525,218	$ 525,663
Accumulated amortization		(317,318)	(305,787)
Other intangible assets, net		207,900	219,876
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1],[2]	491,461	492,656
Accumulated amortization		(290,131)	(279,287)
Non-compete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1]	31,790	31,040
Accumulated amortization		(25,906)	(25,242)
Other [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		1,967	1,967
Accumulated amortization		$ (1,281)	$ (1,258)

[1] Reflects the impact from the acquisition (Note 3).

[2] Reflects the impact from the disposition of certain assets and operations in a non-strategic market of the propane segment (Note 3).