Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ 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. 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		44.9		0.6
Issuance under employee stock plans	0.7		0.7				0.7
Issuance under employee stock plans, Shares		0.6
Employees’ taxes paid upon vesting of restricted stock units	(3.8)		(3.8)				(3.8)
Employees' taxes paid upon vesting of restricted stock units, Shares		(0.1)
Stock-based compensation expense	10.1		10.1				10.1
Net income (loss)	9.1				2.8		2.8	6.3
Dividend payments to a joint venture shareholder	(0.2)							(0.2)
Other comprehensive income (loss)	(13.1)					(13.1)	(13.1)
Ending balance at Jul. 01, 2022	895.5	$ 0.1	521.9	$ (3.3)	340.2	(13.3)	845.6	49.9
Ending balance, Shares at Jul. 01, 2022		45.4		0.6
Beginning balance at Apr. 01, 2022	926.3	$ 0.1	520.5	$ (3.3)	365.3	(3.0)	879.6	46.7
Beginning balance, Shares at Apr. 01, 2022		45.0		0.6
Issuance under employee stock plans	0.7		0.7				0.7
Issuance under employee stock plans, Shares		0.5
Employees’ taxes paid upon vesting of restricted stock units	(3.8)		(3.8)				(3.8)
Employees' taxes paid upon vesting of restricted stock units, Shares		(0.1)
Stock-based compensation expense	4.5		4.5				4.5
Net income (loss)	(21.7)				(25.1)		(25.1)	3.4
Dividend payments to a joint venture shareholder	(0.2)							(0.2)
Other comprehensive income (loss)	(10.3)					(10.3)	(10.3)
Ending balance at Jul. 01, 2022	895.5	$ 0.1	521.9	$ (3.3)	340.2	(13.3)	845.6	49.9
Ending balance, Shares at Jul. 01, 2022		45.4		0.6
Beginning balance at Dec. 30, 2022	937.0	$ 0.1	530.8	$ (15.4)	377.8	(5.4)	887.9	49.1
Beginning balance, Shares at Dec. 30, 2022		45.2		0.9
Issuance under employee stock plans, Shares		0.5
Employees’ taxes paid upon vesting of restricted stock units	(2.2)		(2.2)				(2.2)
Employees' taxes paid upon vesting of restricted stock units, Shares		(0.1)
Repurchase of shares, Shares		(0.8)		0.8
Repurchase of shares	(23.7)			$ (23.7)			(23.7)
Stock-based compensation expense	4.7		4.7				4.7
Net income (loss)	(7.8)				(12.8)		(12.8)	5.0
Dividend payments to a joint venture shareholder	(0.1)							(0.1)
Other comprehensive income (loss)	(1.7)					(4.1)	(4.1)	2.4
Ending balance at Jun. 30, 2023	906.2	$ 0.1	533.3	$ (39.1)	365.0	(9.5)	849.8	56.4
Ending balance, Shares at Jun. 30, 2023		44.8		1.7
Beginning balance at Mar. 31, 2023	925.0	$ 0.1	534.3	$ (29.6)	374.4	(8.5)	870.7	54.3
Beginning balance, Shares at Mar. 31, 2023		44.8		1.4
Issuance under employee stock plans, Shares		0.4
Employees’ taxes paid upon vesting of restricted stock units	(2.0)		(2.0)				(2.0)
Employees' taxes paid upon vesting of restricted stock units, Shares		(0.1)
Repurchase of shares, Shares		(0.3)		0.3
Repurchase of shares	(9.5)			$ (9.5)			(9.5)
Stock-based compensation expense	1.0		1.0				1.0
Net income (loss)	(8.2)				(9.4)		(9.4)	1.2
Dividend payments to a joint venture shareholder	(0.1)							(0.1)
Other comprehensive income (loss)	0.0					(1.0)	(1.0)	1.0
Ending balance at Jun. 30, 2023	$ 906.2	$ 0.1	$ 533.3	$ (39.1)	$ 365.0	$ (9.5)	$ 849.8	$ 56.4
Ending balance, Shares at Jun. 30, 2023		44.8		1.7