Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044

Name:	us-gaap_ContractWithCustomerAssetNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Sep. 26, 2020
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 32,419	$ 32,676
Contract assets	$ 6,102		$ 4,700
Propane [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	88.00%	88.00%
Fuel Oil and Refined Fuels [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	5.00%	5.00%
Natural Gas and Electricity [Member]
Disaggregation Of Revenue [Line Items]
Segment reporting, percentage of revenue	3.00%	3.00%