Disaggregation of Revenue - Schedule of Revenue Disaggregation for Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 25, 2023	Mar. 26, 2022	Mar. 25, 2023	Mar. 26, 2022
Disaggregation Of Revenue [Line Items]
Total revenues	$ 526,501	$ 588,095	$ 923,971	$ 963,502
Retail [Member] | Residential [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	304,477	342,560	522,600	540,565
Retail [Member] | Commercial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	131,614	151,833	240,302	262,785
Retail [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	39,470	41,376	74,848	75,570
Retail [Member] | Agricultural [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	14,122	15,916	28,473	29,719
Retail [Member] | Government [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	26,823	28,281	44,831	44,265
Wholesale [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 9,995	$ 8,129	$ 12,917	$ 10,598