Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Revenues:
Total revenues	$ 363.3	$ 254.3	$ 1,029.0	$ 779.8
Cost of revenues:
Total cost of revenues	288.7	206.8	814.8	639.3
Gross profit	74.6	47.5	214.2	140.5
Operating expenses:
Research and development	3.5	3.6	10.7	10.9
Sales and marketing	6.0	5.9	17.7	16.7
General and administrative	30.2	29.7	97.5	87.4
Total operating expenses	39.7	39.2	125.9	115.0
Income from operations	34.9	8.3	88.3	25.5
Interest income	0.2		0.7	0.4
Interest expense	(4.1)	(6.6)	(13.1)	(19.9)
Other income (expense), net	(1.1)	3.1	(3.2)	4.2
Income before provision for income taxes	29.9	4.8	72.7	10.2
Provision for income taxes	4.8	3.9	15.0	8.2
Net income	25.1	0.9	57.7	2.0
Less: Net income attributable to noncontrolling interests	0.7	0.4	2.6	1.1
Net income attributable to UCT	$ 24.4	$ 0.5	$ 55.1	$ 0.9
Net income per share attributable to UCT common stockholders:
Basic	$ 0.60	$ 0.01	$ 1.37	$ 0.02
Diluted	$ 0.59	$ 0.01	$ 1.35	$ 0.02
Shares used in computing net income per share:
Basic	40.4	39.5	40.1	39.4
Diluted	41.1	40.0	40.9	39.7
Product [Member]
Revenues:
Product	$ 294.4	$ 200.0	$ 831.7	$ 610.6
Cost of revenues:
Product	243.6	170.1	687.6	525.7
Services [Member]
Revenues:
Product	68.9	54.3	197.3	169.2
Cost of revenues:
Product	$ 45.1	$ 36.7	$ 127.2	$ 113.6