Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Jun. 25, 2021	Jun. 26, 2020
Revenues:
Total revenues	$ 515.2	$ 344.8	$ 932.8	$ 665.7
Cost of revenues:
Total cost of revenues	415.3	270.9	746.0	526.1
Gross profit	99.9	73.9	186.8	139.6
Operating expenses:
Research and development	6.1	3.8	10.3	7.2
Sales and marketing	12.7	5.9	20.3	11.7
General and administrative	49.2	33.4	83.9	67.3
Total operating expenses	68.0	43.1	114.5	86.2
Income from operations	31.9	30.8	72.3	53.4
Interest income	0.1	0.2	0.2	0.5
Interest expense	(7.1)	(3.8)	(10.7)	(9.0)
Other income (expense), net	(0.7)	0.6	(5.0)	(2.1)
Income before provision for income taxes	24.2	27.8	56.8	42.8
Provision for income taxes	6.2	5.7	13.2	10.2
Net income	18.0	22.1	43.6	32.6
Less: Net income attributable to noncontrolling interests	0.9	0.8	1.5	1.9
Net income attributable to UCT	$ 17.1	$ 21.3	$ 42.1	$ 30.7
Net income per share attributable to UCT common stockholders:
Basic	$ 0.39	$ 0.53	$ 1.00	$ 0.77
Diluted	$ 0.39	$ 0.52	$ 0.98	$ 0.75
Shares used in computing net income per share:
Basic	43.3	40.1	41.9	39.9
Diluted	44.3	40.8	42.9	40.8
Product [Member]
Revenues:
Products	$ 442.5	$ 277.9	$ 788.1	$ 537.3
Cost of revenues:
Products	367.9	229.3	651.5	444.0
Gross profit			136.6
Operating expenses:
Income from operations			58.2
Services [Member]
Revenues:
Products	72.7	66.9	144.7	128.4
Cost of revenues:
Products	$ 47.4	$ 41.6	94.5	$ 82.1
Gross profit			50.2
Operating expenses:
Income from operations			$ 14.1