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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. 30, 2019 | Mar. 31, 2018 | Mar. 30, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 504,377 | $ 536,282 | $ 881,481 | $ 909,559
Retail [Member] | Residential [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 312,110 | 323,045 | 533,824 | 537,253
Retail [Member] | Commercial [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 118,081 | 125,597 | 214,659 | 219,539
Retail [Member] | Industrial [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 33,477 | 34,906 | 62,431 | 63,029
Retail [Member] | Agricultural [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 13,867 | 14,400 | 27,768 | 30,401
Retail [Member] | Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 23,339 | 24,717 | 39,273 | 39,843
Wholesale [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 3,503 | $ 13,616 | $ 3,526 | $ 19,494

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- Definition Amount, including 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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