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Reportable Segments - Financial Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 23, 2018	Jun. 28, 2020	Jun. 30, 2019	Jun. 24, 2018
Segment Reporting Information [Line Items]
Revenue	$ 205.7	$ 215.5	$ 239.9	$ 242.8	$ 251.2	$ 274.1	$ 280.5	$ 274.2	$ 903.9	$ 1,080.0	$ 924.9
Gross profit	50.8	$ 61.4	$ 61.9	$ 74.2	88.7	$ 100.5	$ 103.5	$ 98.3	$ 248.3	$ 391.0	$ 302.0
Gross margin (as a percent)									27.00%	36.00%	33.00%
Incremental manufacturing costs related to COVID-19									$ 8.5
Operating Segments
Segment Reporting Information [Line Items]
Revenue									903.9	$ 1,080.0	$ 924.9
Gross profit									275.7	408.7	316.4
Operating Segments | Wolfspeed
Segment Reporting Information [Line Items]
Revenue									470.7	538.2	328.6
Gross profit									$ 184.6	$ 258.7	$ 158.5
Gross margin (as a percent)									39.00%	48.00%	48.00%
Operating Segments | LED Products
Segment Reporting Information [Line Items]
Revenue									$ 433.2	$ 541.8	$ 596.3
Gross profit									$ 91.1	$ 150.0	$ 157.9
Gross margin (as a percent)									21.00%	28.00%	26.00%
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gross profit									$ (27.4)	$ (17.7)	$ (9.0)
Transaction costs	$ 0.0				$ 0.0				$ 0.0	$ 0.0	$ (5.4)

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