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Reportable Segments - Financial Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 215.5	$ 274.0	$ 698.2	$ 828.7
Gross profit	$ 61.4	$ 100.5	$ 197.5	$ 302.3
Gross margin (as a percent)	28.50%	36.70%	28.30%	36.50%
Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 215.5	$ 274.0	$ 698.2	$ 828.7
Gross profit	65.8	105.8	215.2	315.7
Operating Segments | Wolfspeed
Segment Reporting Information [Line Items]
Revenue	113.9	141.2	362.3	403.9
Gross profit	$ 45.5	$ 68.8	$ 146.3	$ 193.9
Gross margin (as a percent)	39.90%	48.70%	40.40%	48.00%
Operating Segments | LED Products
Segment Reporting Information [Line Items]
Revenue	$ 101.6	$ 132.8	$ 335.9	$ 424.8
Gross profit	$ 20.3	$ 37.0	$ 68.9	$ 121.8
Gross margin (as a percent)	20.00%	27.90%	20.50%	28.70%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gross profit	$ (4.4)	$ (3.9)	$ (17.7)	$ (10.8)
COGS acquisition related costs	$ 0.0	$ (1.4)	$ 0.0	$ (2.6)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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