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Reportable Segments - Financial Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 239.9	$ 280.5	$ 482.7	$ 554.7
Gross profit	$ 61.9	$ 103.5	$ 136.1	$ 201.8
Gross margin (as a percent)	25.80%	36.90%	28.20%	36.40%
Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 239.9	$ 280.5	$ 482.7	$ 554.7
Gross profit	68.3	108.2	149.4	209.9
Operating Segments | Wolfspeed
Segment Reporting Information [Line Items]
Revenue	120.7	135.3	248.4	262.7
Gross profit	$ 41.8	$ 64.7	$ 100.8	$ 125.1
Gross margin (as a percent)	34.60%	47.80%	40.60%	47.60%
Operating Segments | LED Products
Segment Reporting Information [Line Items]
Revenue	$ 119.2	$ 145.2	$ 234.3	$ 292.0
Gross profit	$ 26.5	$ 43.5	$ 48.6	$ 84.8
Gross margin (as a percent)	22.20%	30.00%	20.70%	29.00%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gross profit	$ (6.4)	$ (4.7)	$ (13.3)	$ (6.9)
COGS acquisition related costs	$ 0.0	$ 0.0	$ 0.0	$ (1.2)

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