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. 25, 2021	$ 892.7	$ 0.1	$ 514.9	$ (3.3)	$ 337.4	$ (0.2)	$ 848.9	$ 43.8
Beginning balance, Shares at Dec. 25, 2021		44.9		0.6
Issuance under employee stock plans, Shares		0.1
Stock-based compensation expense	5.6		5.6				5.6
Net income (loss)	30.8				27.9		27.9	2.9
Other comprehensive income (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		45.0		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	(0.2)		(0.2)				(0.2)
Issuance under employee stock plans, Shares		0.1
Repurchase of shares, Shares		(0.5)		0.5
Repurchase of shares	(14.2)			$ (14.2)			(14.2)
Stock-based compensation expense	3.7		3.7				3.7
Net income (loss)	0.4				(3.4)		(3.4)	3.8
Other comprehensive income (loss)	(1.7)					(3.1)	(3.1)	1.4
Ending balance at Mar. 31, 2023	$ 925.0	$ 0.1	$ 534.3	$ (29.6)	$ 374.4	$ (8.5)	$ 870.7	$ 54.3
Ending balance, Shares at Mar. 31, 2023		44.8		1.4