Business Combination - Pro Forma Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 29, 2025	Mar. 31, 2026	Mar. 29, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Pro forma revenue	$ 1,564,316	$ 3,256,987	$ 3,152,755
Pro forma net (loss) income	$ 120,576	$ (52,594)	$ (9,803)