Disaggregation of Revenue - Schedule of Revenue Disaggregation for Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2024	Jun. 24, 2023	Jun. 29, 2024	Jun. 24, 2023
Disaggregation Of Revenue [Line Items]
Total revenues	$ 254,610	$ 278,628	$ 1,118,531	$ 1,202,599
Retail [Member] | Residential [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	125,910	142,941	609,192	665,541
Retail [Member] | Commercial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	79,294	82,321	304,647	322,623
Retail [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	27,629	28,362	95,917	103,210
Retail [Member] | Government [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	10,754	12,039	52,850	56,870
Retail [Member] | Agricultural [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	5,650	6,750	31,405	35,223
Wholesale [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 5,373	$ 6,215	$ 24,520	$ 19,132