Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020	Sep. 26, 2020
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 32,538	$ 24,920	$ 64,957	$ 57,596
Contract assets	$ 21,186		$ 21,186		$ 4,700
Propane [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	89.00%	89.00%	89.00%	89.00%
Fuel Oil and Refined Fuels [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	6.00%	6.00%	6.00%	6.00%
Natural Gas and Electricity [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	2.00%	2.00%	2.00%	2.00%