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Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Contract with customer, liability revenue recognized | $ 67,117 | $ 66,697 | $ 61,384
Contract assets | $ 4,700 | $ 7,051 |
Propane [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Segment reporting, percentage of revenue | 85.00% |  |
Fuel Oil and Refined Fuels [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Segment reporting, percentage of revenue | 7.00% |  |
Natural Gas and Electricity [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Segment reporting, percentage of revenue | 4.00% |  |

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- Definition 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. + References 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 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Period Type: |

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- Details
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