Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	1 Months Ended	6 Months Ended		11 Months Ended	12 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Jun. 16, 2022	Nov. 14, 2023	Dec. 27, 2024
Income Statement [Abstract]
Net sales	$ 243.0	$ 1,039.7	$ 874.6	$ 1,622.9	$ 1,979.7
Cost of sales	179.1	991.0	582.0	1,300.5	1,152.6
Gross profit	63.9	48.7	292.6	322.4	827.1
Selling, general and administrative expenses	64.2	268.9	266.3	448.2	566.8
Research and development expenses	15.9	64.2	65.5	97.1	115.7
Restructuring charges, net	0.0	11.1	9.6	0.9	10.5
Non-restructuring impairment charges	2.6	0.0	0.0	135.9	0.0
Operating income (loss)	(20.2)	(316.7)	(57.8)	(517.4)	90.2
Interest expense	(28.3)	(324.3)	(108.6)	(507.2)	(228.3)
Interest income	0.9	3.9	0.6	14.7	27.0
Other (expense) income, net	5.4	10.0	(14.6)	(6.5)	(9.1)
Reorganization items, net	(4.0)	(23.2)	(630.9)	(892.7)	0.0
Income (loss) from continuing operations before income taxes	(46.2)	(650.3)	(811.3)	(1,909.1)	614.5
Income tax expense (benefit)	(8.0)	(52.0)	(497.3)	(277.8)	137.9
Income (loss) from continuing operations	(38.2)	(598.3)	(314.0)	(1,631.3)	476.6
Income from discontinued operations, net of tax expense	0.0	0.2	0.9	0.0	1.3
Net income (loss)	$ (38.2)	$ (598.1)	$ (313.1)	$ (1,631.3)	$ 477.9
Income (loss) from continuing operations	$ (1.94)	$ (45.43)	$ (3.70)	$ (122.75)	$ 24.20
Income from discontinued operations	0	0.02	0.01	0	0.07
Earnings Per Share, Basic	$ (1.94)	$ (45.41)	$ (3.69)	$ (122.75)	$ 24.26
Basic weighted-average shares outstanding	19.7	13.2	84.8	13.3	19.7
Income (loss) from continuing operations	$ (1.94)	$ (45.43)	$ (3.70)	$ (122.75)	$ 24.11
Income from discontinued operations	0	0.02	0.01	0	0.07
Earnings Per Share, Diluted	$ (1.94)	$ (45.41)	$ (3.69)	$ (122.75)	$ 24.17
Weighted Average Number of Shares Outstanding, Diluted	19.7	13.2	84.8	13.3	19.8
Basic income (loss) per share (Note 9):
Income (loss) from continuing operations	$ (1.94)	$ (45.43)	$ (3.70)	$ (122.75)	$ 24.20
Income from discontinued operations	$ 0	$ 0.02	$ 0.01	$ 0	$ 0.07
Basic weighted-average shares outstanding	19.7	13.2	84.8	13.3	19.7
Diluted income (loss) per share (Note 9):
Income (loss) from continuing operations	$ (1.94)	$ (45.43)	$ (3.70)	$ (122.75)	$ 24.11
Income from discontinued operations	0	0.02	0.01	0	0.07
Net income (loss)	$ (1.94)	$ (45.41)	$ (3.69)	$ (122.75)	$ 24.17
Diluted weighted-average shares outstanding	19.7	13.2	84.8	13.3	19.8