Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 26, 2021	Mar. 27, 2020
Revenues:
Total revenues	$ 417.6	$ 320.9
Cost of revenues:
Total cost of revenues	330.7	255.2
Gross profit	86.9	65.7
Operating expenses:
Research and development	4.2	3.4
Sales and marketing	7.6	5.8
General and administrative	34.7	33.9
Total operating expenses	46.5	43.1
Income from operations	40.4	22.6
Interest income	0.1	0.3
Interest expense	(3.6)	(5.2)
Other income (expense), net	(4.3)	(2.7)
Income before provision for income taxes	32.6	15.0
Provision for income taxes	7.0	4.5
Net income	25.6	10.5
Less: Net income attributable to noncontrolling interests	0.6	1.1
Net income attributable to UCT	$ 25.0	$ 9.4
Net income per share attributable to UCT common stockholders:
Basic	$ 0.62	$ 0.24
Diluted	$ 0.60	$ 0.23
Shares used in computing net income per share:
Basic	40.6	39.8
Diluted	41.6	40.7
Product [Member]
Revenues:
Products	$ 345.6	$ 259.4
Cost of revenues:
Products	283.6	214.7
Gross profit	62.0	44.7
Operating expenses:
Income from operations	34.2	20.3
Services [Member]
Revenues:
Products	72.0	61.5
Cost of revenues:
Products	47.1	40.5
Gross profit	24.9	21.0
Operating expenses:
Income from operations	$ 6.2	$ 2.3