Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 8,725	$ 6,735	$ 66,321	$ 65,881
Contract assets	$ 11,169		$ 11,169		$ 7,051
Propane [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	85.00%	85.00%	85.00%	85.00%
Fuel Oil and Refined Fuels [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	8.00%	8.00%	8.00%	8.00%
Natural Gas and Electricity [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	3.00%	3.00%	3.00%	3.00%