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=118956577&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=118944033&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=118944033&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	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Contract with customer, liability revenue recognized	$ 66,697	$ 61,384	$ 73,093
Contract assets	$ 7,051	$ 9,606
Propane [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers	85.00%
Fuel Oil and Refined Fuels [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers	7.00%
Natural Gas and Electricity [Member]
Disaggregation Of Revenue [Line Items]
Percentage of revenue generated from contract with customers	4.00%