Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 6,735	$ 6,758	$ 65,881	$ 60,579
Contract assets	$ 18,581		$ 18,581		$ 9,606
Propane [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers			86.00%
Fuel Oil and Refined Fuels [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers			8.00%
Natural Gas and Electricity [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers			4.00%