Acquisition and Disposition of Businesses - Additional Information (Details)						3 Months Ended			6 Months Ended	11 Months Ended	12 Months Ended
	Apr. 05, 2018 USD ($)	Dec. 08, 2017 USD ($)	Nov. 07, 2017 USD ($)	Apr. 22, 2016 USD ($)	Dec. 15, 2015 USD ($)	Dec. 30, 2017 USD ($)	Jun. 25, 2016 USD ($)	Dec. 26, 2015 USD ($)	Sep. 29, 2018 USD ($)	Sep. 29, 2018 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 24, 2016 USD ($)
Business Acquisition And Dispositions [Line Items]
Number of propane assets and operations acquired	2
Business acquisition, cost of acquired, cash paid	$ 11,900,000		$ 4,871,000
Cash paid to acquire business									$ 10,622,000	$ 4,251,000	$ 14,873,000	$ 0	$ 42,945,000
Business disposition, sales price		$ 2,800,000		$ 26,000,000
(Loss) gain on sale of business						$ (4,823,000)	$ 9,769,000				$ (4,823,000)	$ 0	9,769,000
Period over which the receivables are collected				5 years
Propane USA Distribution, LLC [Member]
Business Acquisition And Dispositions [Line Items]
Business acquisition, cost of acquired, cash paid					$ 45,000,000								0
Cash paid to acquire business								$ 41,250,000					42,945,000
Non-compete Agreements [Member]
Business Acquisition And Dispositions [Line Items]
Business acquisition, cost of acquired, cash paid	$ 1,750,000		$ 750,000
Business disposition, sales price				$ 5,000,000
Non-compete Agreements [Member] | Propane USA Distribution, LLC [Member]
Business Acquisition And Dispositions [Line Items]
Business acquisition, cost of acquired, cash paid					$ 3,000,000								$ 0