Disaggregation of Revenue - Schedule of Revenue Disaggregation for Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2023	Dec. 24, 2022
Disaggregation Of Revenue [Line Items]
Total revenues	$ 365,834	$ 397,470
Retail [Member] | Residential [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	195,895	218,123
Retail [Member] | Commercial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	98,453	108,688
Retail [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	31,746	35,378
Retail [Member] | Government [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	17,073	18,008
Retail [Member] | Agricultural [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	13,450	14,351
Wholesale [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 9,217	$ 2,922