Condensed Consolidated Statements of Operations - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024
Revenues:
Total revenues	$ 510,000,000.0	$ 540,400,000	$ 1,547,300,000	$ 1,534,300,000
Cost of revenues:
Total cost revenues	427,800,000	447,000,000.0	1,301,700,000	1,269,800,000
Gross margin	82,200,000	93,400,000	245,600,000	264,500,000
Operating expenses:
Research and development	7,800,000	7,100,000	23,200,000	21,200,000
Sales and marketing	15,100,000	14,400,000	45,500,000	42,900,000
General and administrative	48,700,000	46,700,000	144,100,000	135,100,000
Impairment of goodwill	0	0	151,100,000	0
Total operating expenses	71,600,000	68,200,000	363,900,000	199,200,000
Income (loss) from operations	10,600,000	25,200,000	(118,300,000)	65,300,000
Interest income	1,100,000	1,100,000	3,000,000.0	3,900,000
Interest expense	(9,900,000)	(12,000,000.0)	(29,900,000)	(35,800,000)
Other income (expense), net	(1,200,000)	(4,100,000)	(2,500,000)	9,300,000
Income (loss) before provision for income taxes	600,000	10,200,000	(147,700,000)	42,700,000
Provision for income taxes	8,700,000	9,900,000	23,300,000	28,200,000
Net income (loss)	(8,100,000)	300,000	(171,000,000.0)	14,500,000
Less: Net income attributable to noncontrolling interests	2,800,000	2,600,000	6,900,000	7,100,000
Net income (loss) attributable to UCT	$ (10,900,000)	$ (2,300,000)	$ (177,900,000)	$ 7,400,000
Net income (loss) per share attributable to UCT common stockholders:
Basic (in dollars per share)	$ (0.24)	$ (0.05)	$ (3.93)	$ 0.16
Diluted (in dollars per share)	$ (0.24)	$ (0.05)	$ (3.93)	$ 0.16
Shares used in computing net income (loss) per share:
Basic (in shares)	45.4	45.0	45.2	44.8
Diluted (in shares)	45.4	45.0	45.2	45.4
Products
Revenues:
Total revenues	$ 445,000,000.0	$ 479,000,000.0	$ 1,356,900,000	$ 1,350,200,000
Cost of revenues:
Total cost revenues	380,400,000	403,300,000	1,163,900,000	1,141,200,000
Services
Revenues:
Total revenues	65,000,000.0	61,400,000	190,400,000	184,100,000
Cost of revenues:
Total cost revenues	$ 47,400,000	$ 43,700,000	$ 137,800,000	$ 128,600,000