Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 24,920	$ 25,988	$ 57,596	$ 59,146
Contract assets	$ 19,285		$ 19,285		$ 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%