Acquisitions and Dispositions of Businesses - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Apr. 22, 2016	Dec. 15, 2015	Jun. 25, 2016	Dec. 26, 2015	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Business Acquisition And Dispositions [Line Items]
Business disposition, sales price	$ 26,000
Period over which the receivables are collected	5 years
Gain on sale of certain assets and operations			$ 9,769		$ 0	$ 9,769	$ 0
Cash paid to acquire business					$ 0	42,945	$ 6,500
Propane USA Distribution, LLC [Member]
Business Acquisition And Dispositions [Line Items]
Business acquisition, cost of acquired, cash paid		$ 45,000				0
Cash paid to acquire business				$ 41,250		42,945
Non-compete Agreements [Member]
Business Acquisition And Dispositions [Line Items]
Business disposition, sales price	$ 5,000
Non-compete Agreements [Member] | Propane USA Distribution, LLC [Member]
Business Acquisition And Dispositions [Line Items]
Business acquisition, cost of acquired, cash paid		$ 3,000				$ 0