Income Taxes - Narrative (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jun. 24, 2023	Mar. 25, 2023	Dec. 24, 2022	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Income Tax Examination [Line Items]
Income Tax Expense (Benefit)	$ 4,110,000	$ 182,000	$ (252,000)	$ 172,000	$ (4,859,000)	$ 5,000	$ (17,000)	$ 251,000	$ 4,212,000	$ (4,620,000)	$ 0
Valuation allowance	690,231,000				486,920,000				690,231,000	486,920,000	$ 168,308,000	$ 12,608,000
Valuation allowance, deferred tax asset, increase (decrease)									203,300,000
Unrecognized tax benefits	0				$ 0				0	$ 0
Future payments, tax receivable agreement	442,600,000								442,600,000
Tax receivable agreement, liability	0								0
U.S.
Income Tax Examination [Line Items]
Valuation allowance	679,800,000								679,800,000
Operating loss carryforwards	155,100,000								155,100,000
Foreign
Income Tax Examination [Line Items]
Valuation allowance	10,400,000								10,400,000
Foreign | Canada Revenue Agency
Income Tax Examination [Line Items]
Operating loss carryforwards	26,200,000								26,200,000
State and Local Jurisdiction
Income Tax Examination [Line Items]
Operating loss carryforwards	183,300,000								183,300,000
State and Local Jurisdiction | Canada Revenue Agency
Income Tax Examination [Line Items]
Operating loss carryforwards	$ 300,000								$ 300,000