Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Shares [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total stockholders' Equity of UCT [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 25, 2020	$ 551.2	$ 0.1	$ 312.8	$ (3.3)	$ 217.9	$ 5.1	$ 532.6	$ 18.6
Beginning balance, Shares at Dec. 25, 2020		40,600,000		600,000
Stock-based compensation expense	3.5		3.5				3.5
Net income	25.6				25.0		25.0	0.6
Dividend payments to a joint venture shareholder	(0.2)							0.2
Other comprehensive loss	(3.5)					(3.5)	(3.5)
Ending balance at Mar. 26, 2021	576.6	$ 0.1	316.3	$ (3.3)	242.9	1.6	557.6	19.0
Ending balance, Shares at Mar. 26, 2021		40,600,000		600,000
Beginning balance at Dec. 31, 2021	892.7	$ 0.1	514.9	$ (3.3)	337.4	(0.2)	848.9	43.8
Beginning balance, Shares at Dec. 31, 2021		44,900,000		600,000
Issuance under employee stock plans, Shares		100,000
Stock-based compensation expense	5.6		5.6				5.6
Net income	30.8				27.9		27.9	2.9
Other comprehensive loss	(2.8)					(2.8)	(2.8)
Ending balance at Apr. 01, 2022	$ 926.3	$ 0.1	$ 520.5	$ (3.3)	$ 365.3	$ (3.0)	$ 879.6	$ 46.7
Ending balance, Shares at Apr. 01, 2022		45,000,000.0		600,000