Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Revenues:
Total revenues	$ 421.5	$ 608.7	$ 854.8	$ 1,172.9
Cost of revenues:
Total cost revenues	353.4	490.3	713.7	940.7
Gross margin	68.1	118.4	141.1	232.2
Operating expenses:
Research and development	7.2	7.2	14.3	14.1
Sales and marketing	12.7	13.9	25.8	27.7
General and administrative	35.6	46.2	76.0	93.5
Net losss on divestitures	0.0	56.6	0.0	56.6
Total operating expenses	55.5	123.9	116.1	191.9
Income (loss) from operations	12.6	(5.5)	25.0	40.3
Interest income	0.8	0.1	1.3	0.2
Interest expense	(11.8)	(7.3)	(23.6)	(13.7)
Other income (expense), net	(1.5)	(0.3)	1.3	(0.4)
Income (loss) before provision for income taxes	0.1	(13.0)	4.0	26.4
Provision for income taxes	8.3	8.7	11.8	17.3
Net income (loss)	(8.2)	(21.7)	(7.8)	9.1
Less: Net income (loss) attributable to noncontrolling interests	1.2	3.4	5.0	6.3
Net income (loss) attributable to UCT	$ (9.4)	$ (25.1)	$ (12.8)	$ 2.8
Net income (loss) per share attributable to UCT common stockholders:
Basic	$ (0.21)	$ (0.56)	$ (0.29)	$ 0.06
Diluted	$ (0.21)	$ (0.56)	$ (0.29)	$ 0.06
Shares used in computing net income (loss) per share:
Basic	44.7	45.2	44.8	45.1
Diluted	44.7	45.2	44.8	45.7
Product [Member]
Revenues:
Revenue from contract with customer including assessed tax	$ 362.5	$ 532.0	$ 731.1	$ 1,018.9
Cost of revenues:
Cost of goods and service excluding depreciation depletion and amortization	311.1	441.1	626.2	840.6
Services [Member]
Revenues:
Revenue from contract with customer including assessed tax	59.0	76.7	123.7	154.0
Cost of revenues:
Cost of goods and service excluding depreciation depletion and amortization	$ 42.3	$ 49.2	$ 87.5	$ 100.1