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Disaggregation of Revenue - Schedule of Revenue Disaggregation for Customer Type (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 30, 2024
Mar. 25, 2023
Mar. 30, 2024
Mar. 25, 2023
Disaggregation Of Revenue [Line Items]        
Total revenues $ 498,087 $ 526,501 $ 863,921 $ 923,971
Retail [Member] | Residential [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 287,387 304,477 483,282 522,600
Retail [Member] | Commercial [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 126,900 131,614 225,353 240,302
Retail [Member] | Industrial [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 36,542 39,470 68,288 74,848
Retail [Member] | Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 25,023 26,823 42,096 44,831
Retail [Member] | Agricultural [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 12,305 14,122 25,755 28,473
Wholesale [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues $ 9,930 $ 9,995 $ 19,147 $ 12,917