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Reportable Segments - Financial Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 27, 2020	Sep. 29, 2019
Segment Reporting Information [Line Items]
Revenue	$ 216.6	$ 242.8
Gross profit	$ 54.0	$ 74.2
Gross margin (as a percent)	24.90%	30.60%
Incremental manufacturing costs related to COVID-19	$ 0.9
Operating Segments
Segment Reporting Information [Line Items]
Revenue	216.6	$ 242.8
Gross profit	64.7	81.1
Operating Segments | Wolfspeed
Segment Reporting Information [Line Items]
Revenue	115.5	127.7
Gross profit	$ 42.3	$ 59.0
Gross margin (as a percent)	36.60%	46.20%
Operating Segments | LED Products
Segment Reporting Information [Line Items]
Revenue	$ 101.1	$ 115.1
Gross profit	$ 22.4	$ 22.1
Gross margin (as a percent)	22.20%	19.20%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gross profit	$ (10.7)	$ (6.9)

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