v3.26.3
Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 25, 2026
Sep. 26, 2025
Sep. 25, 2026
Sep. 26, 2025
Numerator:        
Net income (loss) attributable to UCT $ 39.1 $ (10.9) $ 29.9 $ (177.9)
Denominator:        
Basic weighted average common shares outstanding (in shares) 45.4 45.4 45.3 45.2
Effect of potential dilutive securities:        
Convertible notes (in shares) 0.0 0.0 0.0 0.0
Employee stock plans (in shares) 0.8 0.0 0.9 0.0
Diluted weighted average common shares outstanding (in shares) 46.2 45.4 46.2 45.2
Net income (loss) per share attributable to UCT:        
Basic (in dollars per share) $ 0.86 $ (0.24) $ 0.66 $ (3.93)
Diluted (in dollars per share) $ 0.85 $ (0.24) $ 0.65 $ (3.93)