Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 30, 2022
Current tax provision:
Federal	$ (30,188)	$ (645)	$ 380
State	(4,447)	(243)	0
Foreign	(267)	0	0
Total current tax (expense) benefit	(34,902)	(888)	380
Deferred tax provision:
Federal	2,046	(6,230)	10,862
State	(372)	(1,835)	209
Total deferred tax benefit (expense)	1,674	(8,065)	11,071
Income tax (expense) benefit	$ (33,228)	$ (8,953)	$ 11,451