Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jun. 25, 2021	Jul. 01, 2022	Jun. 25, 2021
Revenues:
Total revenues	$ 608.7	$ 515.2	$ 1,172.9	$ 932.8
Cost of revenues:
Total cost of revenues	490.3	415.3	940.7	746.0
Gross profit	118.4	99.9	232.2	186.8
Operating expenses:
Research and development	7.2	6.1	14.1	10.3
Sales and marketing	13.9	12.7	27.7	20.3
General and administrative	46.2	49.2	93.5	83.9
Net losss on divestitures	56.6	0.0	56.6	0.0
Total operating expenses	123.9	68.0	191.9	114.5
Income (loss) from operations	(5.5)	31.9	40.3	72.3
Interest income	0.1	0.1	0.2	0.2
Interest expense	(7.3)	(7.1)	(13.7)	(10.7)
Other income (expense), net	(0.3)	(0.7)	(0.4)	(5.0)
Income (loss) before provision for income taxes	(13.0)	24.2	26.4	56.8
Provision for income taxes	8.7	6.2	17.3	13.2
Net income (loss)	(21.7)	18.0	9.1	43.6
Less: Net income (loss) attributable to noncontrolling interests	3.4	0.9	6.3	1.5
Net income attributable to UCT	$ (25.1)	$ 17.1	$ 2.8	$ 42.1
Net income per share attributable to UCT common stockholders:
Basic	$ (0.56)	$ 0.39	$ 0.06	$ 1.00
Diluted	$ (0.56)	$ 0.39	$ 0.06	$ 0.98
Shares used in computing net income per share:
Basic	45.2	43.3	45.1	41.9
Diluted	45.2	44.3	45.7	42.9
Product [Member]
Revenues:
Revenue from contract with customer including assessed tax	$ 532.0	$ 442.5	$ 1,018.9	$ 788.1
Cost of revenues:
Cost of goods and service excluding depreciation depletion and amortization	441.1	367.9	840.6	651.5
Services [Member]
Revenues:
Revenue from contract with customer including assessed tax	76.7	72.7	154.0	144.7
Cost of revenues:
Cost of goods and service excluding depreciation depletion and amortization	$ 49.2	$ 47.4	$ 100.1	$ 94.5