Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (21,438)	$ (54,830)	$ (39,958)	$ (73,902)
Less: Net loss attributable to noncontrolling interests	(17,513)	(46,021)	(32,557)	(62,257)
Net loss attributable to common stockholders	(3,925)	(8,809)	(7,401)	(11,645)
Other comprehensive loss:
Foreign currency translation adjustments	(13)	(502)	(576)	(141)
Changes in unrealized gain on investments, net of income taxes of $— for the three and six months ended March 29, 2025 and March 30, 2024	0	(3,251)	0	(4,163)
Total other comprehensive loss	(13)	(3,753)	(576)	(4,304)
Less: other comprehensive loss attributable to noncontrolling interests	(11)	(3,150)	(472)	(3,618)
Other comprehensive loss attributable to common stockholders	(2)	(603)	(104)	(686)
Comprehensive loss	(21,451)	(58,583)	(40,534)	(78,206)
Less: Comprehensive loss attributable to noncontrolling interests	(17,524)	(49,171)	(33,029)	(65,875)
Total comprehensive loss attributable to common stockholders	$ (3,927)	$ (9,412)	$ (7,505)	$ (12,331)