Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Restructuring Fiscal 2021 Plan	Restructuring Fiscal 2018 Plan	Transferred at Point in Time [Member]	Transferred over Time [Member]	Ordinary Shares	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Loss	Treasury Stock, Common
Shares, Outstanding						13,200,000				0
Beginning balance at Dec. 30, 2022	$ 1,613.7					$ 0.1	$ 2,191.0	$ (588.2)	$ 10.8	$ 0.0
Net loss	(249.3)							(249.3)
Other Comprehensive Income (Loss), Net of Tax	(2.6)								(2.6)
Share-based compensation	2.6						2.6
Ending balance at Mar. 31, 2023	1,364.4					0.1	2,193.6	(837.5)	8.2	0.0
Beginning balance at Dec. 30, 2022	1,613.7					0.1	2,191.0	(588.2)	10.8	0.0
Net loss								(997.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									3.8
Ending balance at Jun. 30, 2023	625.4					$ 0.1	2,196.1	(1,585.3)	14.6	$ (0.1)
Share-based compensation							5.3
Revenue				82.00%	18.00%
Total Restructuring And Related Expense	1.7	$ 0.0	$ 1.7
Restructuring and Related Costs, Non-cash Charges, Including Accelerated Depreciation	(0.8)
Restructuring and Related Costs, Total Charges Expected to be Settled in Cash	0.9
Shares, Outstanding						13,200,000				0
Beginning balance at Mar. 31, 2023	1,364.4					$ 0.1	2,193.6	(837.5)	8.2	$ 0.0
Net loss	(747.8)							(747.8)
Other Comprehensive Income (Loss), Net of Tax	$ 6.4								6.4
Stock Issued During Period, Value, Treasury Stock Reissued										$ (0.1)
Share-Based Payment Arrangement, Expense	(100,000)					200,000				100,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									6.4
Share-based compensation	$ 2.5						2.5
Ending balance at Jun. 30, 2023	625.4					$ 0.1	2,196.1	(1,585.3)	14.6	$ (0.1)
Revenue				83.60%	16.40%
Total Restructuring And Related Expense		0.0	(0.2)
Restructuring and Related Costs, Total Charges Expected to be Settled in Cash	$ (0.2)
Shares, Outstanding						13,400,000				100,000
Shares, Outstanding						19,700,000				0
Beginning balance, ordinary shares (in shares) at Dec. 29, 2023	19,696,335
Beginning balance at Dec. 29, 2023	$ 1,160.2					$ 0.2	1,194.6	(38.2)	3.6	$ 0.0
Net loss	(65.4)							(65.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4.8)								(4.8)
Share-based compensation	1.9
Ending balance at Mar. 29, 2024	$ 1,091.9					0.2	1,196.5	(103.6)	(1.2)	0.0
Share-based compensation							1.9
Beginning balance, ordinary shares (in shares) at Dec. 29, 2023	19,696,335
Beginning balance at Dec. 29, 2023	$ 1,160.2					0.2	1,194.6	(38.2)	3.6	0.0
Net loss								(108.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									(8.3)
Ending balance, ordinary shares (in shares) at Jun. 28, 2024	19,696,335
Ending balance at Jun. 28, 2024	$ 1,048.5					$ 0.2	1,199.9	(146.9)	(4.7)	$ 0.0
Share-based compensation							5.3
Revenue				85.80%	14.20%
Total Restructuring And Related Expense	10.4	10.4	0.0
Restructuring and Related Costs, Non-cash Charges, Including Accelerated Depreciation	0.0
Restructuring and Related Costs, Total Charges Expected to be Settled in Cash	10.4
Shares, Outstanding						19,700,000				0
Beginning balance at Mar. 29, 2024	1,091.9					$ 0.2	1,196.5	(103.6)	(1.2)	$ 0.0
Net loss	(43.3)							(43.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3.5)								(3.5)
Share-based compensation	$ 3.4
Ending balance, ordinary shares (in shares) at Jun. 28, 2024	19,696,335
Ending balance at Jun. 28, 2024	$ 1,048.5					$ 0.2	1,199.9	$ (146.9)	$ (4.7)	$ 0.0
Share-based compensation							$ 3.4
Revenue				86.90%	13.10%
Total Restructuring And Related Expense		$ 0.2	$ 0.0
Restructuring and Related Costs, Total Charges Expected to be Settled in Cash	$ 0.2
Shares, Outstanding						19,700,000				0