Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2021	Sep. 25, 2020	Sep. 24, 2021	Sep. 25, 2020
Revenues:
Total revenues	$ 553.7	$ 363.3	$ 1,486.5	$ 1,029.0
Cost of revenues:
Total cost of revenues	439.6	288.7	1,185.6	814.8
Gross profit	114.1	74.6	300.9	214.2
Operating expenses:
Research and development	6.5	3.5	16.8	10.7
Sales and marketing	13.8	6.0	34.1	17.7
General and administrative	43.2	30.2	127.1	97.5
Total operating expenses	63.5	39.7	178.0	125.9
Income from operations	50.6	34.9	122.9	88.3
Interest income	0.1	0.2	0.3	0.7
Interest expense	(6.9)	(4.1)	(17.6)	(13.1)
Other income (expense), net	(1.4)	(1.1)	(6.4)	(3.2)
Income before provision for income taxes	42.4	29.9	99.2	72.7
Provision for income taxes	8.4	4.8	21.6	15.0
Net income	34.0	25.1	77.6	57.7
Less: Net income attributable to noncontrolling interests	2.1	0.7	3.6	2.6
Net income attributable to UCT	$ 31.9	$ 24.4	$ 74.0	$ 55.1
Net income per share attributable to UCT common stockholders:
Basic	$ 0.71	$ 0.60	$ 1.73	$ 1.37
Diluted	$ 0.70	$ 0.59	$ 1.69	$ 1.35
Shares used in computing net income per share:
Basic	44.8	40.4	42.8	40.1
Diluted	45.4	41.1	43.7	40.9
Product [Member]
Revenues:
Products	$ 482.0	$ 294.4	$ 1,270.1	$ 831.7
Cost of revenues:
Products	393.4	243.6	1,044.9	687.6
Gross profit	88.6	50.8	225.2	144.1
Operating expenses:
Income from operations	43.8	27.4	102.0	72.0
Services [Member]
Revenues:
Products	71.7	68.9	216.4	197.3
Cost of revenues:
Products	46.2	45.1	140.7	127.2
Gross profit	25.5	23.8	75.7	70.1
Operating expenses:
Income from operations	$ 6.8	$ 7.5	$ 20.9	$ 16.3