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 stock holder's Equity of UCT [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 27, 2019	$ 452.5	$ 0.1	$ 300.9	$ (3.3)	$ 140.3	$ (1.3)	$ 436.7	$ 15.8
Beginning balance, Shares at Dec. 27, 2019		39,900,000		600,000
Issuance under employee stock plans	0.6		0.6				0.6
Issuance under employee stock plans, Shares		800,000
Stock-based compensation expense	12.8		12.8				12.8
Employees’ taxes paid upon vesting of restricted stock units	(1.5)		(1.5)				(1.5)
Employees' taxes paid upon vesting of restricted stock units, Shares		(100,000)
Net income	80.4				77.6		77.6	2.8
Other comprehensive income (loss)	6.4					6.4	6.4
Ending balance at Dec. 25, 2020	551.2	$ 0.1	312.8	$ (3.3)	217.9	5.1	532.6	18.6
Ending balance, Shares at Dec. 25, 2020		40,600,000		600,000
Issuance under employee stock plans	0.8		0.8				0.8
Issuance under employee stock plans, Shares		700,000
Issuance of common stock	192.8		192.8				192.8
Issuance of common stock, Shares		3,700,000
Stock-based compensation expense	15.8		15.8				15.8
Employees’ taxes paid upon vesting of restricted stock units	(7.3)		(7.3)				(7.3)
Employees' taxes paid upon vesting of restricted stock units, Shares		(100,000)
Dividend income	(0.1)							(0.1)
Acquisition of Ham-Let	1.9							1.9
Reclassification related to Cinos Korea	16.5							16.5
Net income	126.4				119.5		119.5	6.9
Other comprehensive income (loss)	(5.3)					(5.3)	(5.3)
Ending balance at Dec. 31, 2021	892.7	$ 0.1	514.9	$ (3.3)	337.4	(0.2)	848.9	43.8
Ending balance, Shares at Dec. 31, 2021		44,900,000		600,000
Issuance under employee stock plans	0.7		0.7				0.7
Issuance under employee stock plans, Shares		700,000
Repurchase of shares, Shares		(300,000)		(300,000)
Repurchase of shares	(12.1)			$ 12.1			12.1
Stock-based compensation expense	19.1		19.1				19.1
Employees’ taxes paid upon vesting of restricted stock units	(3.9)		(3.9)				(3.9)
Employees' taxes paid upon vesting of restricted stock units, Shares		(100,000)
Dividend income	(0.3)							(0.3)
Net income	50.4				40.4		40.4	10.0
Other comprehensive income (loss)	(7.7)					(5.2)	(5.2)	(2.5)
Divestiture of a subsidiary	(1.9)							(1.9)
Ending balance at Dec. 30, 2022	$ 937.0	$ 0.1	$ 530.8	$ (15.4)	$ 377.8	$ (5.4)	$ 887.9	$ 49.1
Ending balance, Shares at Dec. 30, 2022		45,200,000		900,000