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Reportable Segments - Inventory by Reportable Segment (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Jun. 30, 2019
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Segment Reporting Information [Line Items] |  |
Inventories | $ 179.1 | $ 187.4
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Inventories | 173.5 | 180.8
Operating Segments | Wolfspeed |  |
Segment Reporting Information [Line Items] |  |
Inventories | 97.3 | 81.6
Operating Segments | LED Products |  |
Segment Reporting Information [Line Items] |  |
Inventories | 76.2 | 99.2
Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Inventories | $ 5.6 | $ 6.6

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