Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2024	Mar. 25, 2023	Mar. 30, 2024	Mar. 25, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (40,952)	$ (55,416)	$ (53,919)	$ (123,402)
Less: Net loss attributable to noncontrolling interests	(34,372)	(49,298)	(45,411)	(110,091)
Net loss attributable to common stockholders	(6,580)	(6,118)	(8,508)	(13,311)
Other comprehensive income (loss):
Foreign currency translation adjustments	(502)	(290)	(141)	(482)
Changes in unrealized gain on investments, net of income taxes of $— for the three and six months ended March 30, 2024 and March 25, 2023	(3,251)	2,352	(4,163)	2,352
Total other comprehensive income (loss)	(3,753)	2,062	(4,304)	1,870
Less: other comprehensive income (loss) attributable to noncontrolling interests	(3,150)	1,834	(3,618)	1,662
Other comprehensive income (loss) attributable to common stockholders	(603)	228	(686)	208
Comprehensive loss	(44,705)	(53,354)	(58,223)	(121,532)
Less: Comprehensive loss attributable to noncontrolling interests	(37,522)	(47,464)	(49,029)	(108,429)
Total comprehensive loss attributable to common stockholders	$ (7,183)	$ (5,890)	$ (9,194)	$ (13,103)