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Disaggregation of Revenue - Schedule of Revenue Disaggregation for Customer Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 401,055 | $ 504,377 | $ 734,933 | $ 881,481
Retail [Member] | Residential [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 248,601 | 312,110 | 445,487 | 533,824
Retail [Member] | Commercial [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 95,328 | 118,081 | 178,663 | 214,659
Retail [Member] | Industrial [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 28,655 | 33,477 | 55,254 | 62,431
Retail [Member] | Agricultural [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 10,673 | 13,867 | 23,568 | 27,768
Retail [Member] | Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 17,787 | 23,339 | 31,935 | 39,273
Wholesale [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 12 | $ 3,503 | $ 26 | $ 3,526

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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