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Income Taxes - Income Tax Expense (Benefit) Related to Continuing Operations (Details)	12 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 27, 2020
(Percent of (Loss) Income Before Income Taxes)
Computed “expected” income tax expense	21.00%	21.00%	21.00%
State income tax benefit, net of federal tax benefit	(8.90%)	5.60%	21.70%
Net income of associated companies	(77.20%)	(1.80%)	(18.30%)
Resolution of tax matters	(32.20%)	3.20%	(30.50%)
Remeasurement due to rate changes	(11.20%)	0.10%	(31.00%)
Non-deductible expenses	124.00%	0.90%	19.40%
Provision to return adjustment	70.20%	0.00%	0.00%
Valuation allowance	11.90%	(6.00%)	125.20%
Wage credit, net addback	(7.50%)	0.00%	0.00%
Warrant valuation	(1.90%)	(0.40%)	(7.30%)
Other	0.00%	0.00%	4.40%
Total percent of income (loss) before income taxes	88.20%	22.60%	104.60%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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