Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Dec. 25, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 50.4	$ 126.4	$ 80.4
Other comprehensive income (loss):
Change in cumulative translation adjustment, net of tax	(9.9)	(5.0)	6.5
Change in pension net actuarial gain (loss), net of tax	1.2	0.4	(0.1)
Change in fair value of derivatives, net of tax	1.0	(0.7)	0.0
Total other comprehensive income (loss)	(7.7)	(5.3)	6.4
Comprehensive income	42.7	121.1	86.8
Comprehensive income, attributable to noncontrolling interests	7.5	6.9	2.8
Comprehensive income attributable to UCT	$ 35.2	$ 114.2	$ 84.0