Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Restructuring Fiscal 2021 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					19,700,000
Treasury Stock, Common, Shares									0
Beginning balance at Dec. 29, 2023	$ 1,160.2				$ 0.2	$ 1,194.6	$ (38.2)	$ 3.6	$ 0.0
Net Income (Loss)	(65.4)						(65.4)
Other Comprehensive Income (Loss), Net of Tax	(4.8)							(4.8)
Share-based compensation	1.9					1.9
Ending balance at Mar. 29, 2024	1,091.9				0.2	1,196.5	(103.6)	(1.2)	0.0
Beginning balance at Dec. 29, 2023	1,160.2				0.2	1,194.6	(38.2)	3.6	0.0
Net Income (Loss)							(108.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent								(8.3)
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
Shares, Outstanding					19,700,000
Treasury Stock, Common, Shares									0
Beginning balance at Mar. 29, 2024	1,091.9				$ 0.2	1,196.5	(103.6)	(1.2)	$ 0.0
Net Income (Loss)	(43.3)						(43.3)
Other Comprehensive Income (Loss), Net of Tax	(3.5)							(3.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent								(3.5)
Share-based compensation	3.4					3.4
Ending balance at Jun. 28, 2024	$ 1,048.5				$ 0.2	1,199.9	(146.9)	(4.7)	$ 0.0
Revenue			86.90%	13.10%
Total Restructuring And Related Expense		0.2
Shares, Outstanding					19,700,000				0
Shares, Outstanding					19,700,000
Treasury Stock, Common, Shares	0								0
Beginning balance, ordinary shares (in shares) at Dec. 27, 2024	19,696,335
Beginning balance at Dec. 27, 2024	$ 1,645.8				$ 0.2	1,199.8	439.7	6.1	$ 0.0
Net Income (Loss)	(27.7)						(27.7)
Stock Issued During Period, Value, Treasury Stock Reissued	(1.0)				$ 0.0	0.9			$ (1.9)
Share-Based Payment Arrangement, Expense					100,000				0.0
Common Stock, Amount, Cancelled	0.1					(0.8)	0.9
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	3.1							3.1
Share-based compensation	9.7					9.7
Ending balance at Mar. 28, 2025	$ 1,630.0				$ 0.2	1,209.6	412.9	9.2	$ (1.9)
Beginning balance, ordinary shares (in shares) at Dec. 27, 2024	19,696,335
Beginning balance at Dec. 27, 2024	$ 1,645.8				0.2	1,199.8	439.7	6.1	0.0
Net Income (Loss)							(25.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent								7.8
Ending balance, ordinary shares (in shares) at Jun. 27, 2025	19,762,306
Ending balance at Jun. 27, 2025	$ 1,641.9				$ 0.2	1,214.4	415.3	13.9	$ (1.9)
Share-based compensation						14.8
Revenue			86.30%	13.70%
Total Restructuring And Related Expense		(2.2)
Shares, Outstanding					19,800,000
Treasury Stock, Common, Shares									0.0
Beginning balance at Mar. 28, 2025	1,630.0				$ 0.2	1,209.6	412.9	9.2	$ (1.9)
Net Income (Loss)	2.4						2.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4.7							4.7
Share-based compensation	$ 4.8
Ending balance, ordinary shares (in shares) at Jun. 27, 2025	19,762,306
Ending balance at Jun. 27, 2025	$ 1,641.9				$ 0.2	1,214.4	$ 415.3	$ 13.9	$ (1.9)
Share-based compensation						$ 4.8
Revenue			87.20%	12.80%
Total Restructuring And Related Expense		$ (0.2)
Shares, Outstanding					19,800,000				0.0
Treasury Stock, Common, Shares	25,547