Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Dec. 27, 2019
Revenues:
Total revenues	$ 2,101.6	$ 1,398.6	$ 1,066.2
Cost of revenues:
Total cost revenues	1,671.6	1,106.8	869.4
Gross margin	430.0	291.8	196.8
Operating expenses:
Research and development	24.5	14.8	14.6
Sales and marketing	48.2	25.1	22.4
General and administrative	171.6	130.5	129.9
Total operating expenses	244.3	170.4	166.9
Income from operations	185.7	121.4	29.9
Interest income	0.4	0.9	0.4
Interest expense	24.2	16.9	25.6
Other income (expense), net	(7.6)	(5.7)	(2.4)
Income before provision for income taxes	154.3	99.7	2.3
Provision for income taxes	27.9	19.3	10.0
Net income (loss)	126.4	80.4	(7.7)
Less: Net income attributable to noncontrolling interests	6.9	2.8	1.7
Net income (loss) attributable to UCT	$ 119.5	$ 77.6	$ (9.4)
Net income (loss) per share attributable to UCT common stockholders:
Basic	$ 2.75	$ 1.93	$ (0.24)
Diluted	$ 2.69	$ 1.89	$ (0.24)
Shares used in computing net income (loss) per share:
Basic	43.5	40.2	39.5
Diluted	44.4	41.1	39.5
Product [Member]
Revenues:
Product	$ 1,803.9	$ 1,131.2	$ 840.8
Cost of revenues:
Product	1,478.7	934.7	719.0
Services [Member]
Revenues:
Product	297.7	267.4	225.4
Cost of revenues:
Product	$ 192.9	$ 172.1	$ 150.4