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Financial Statement Details - Inventories (Details) - USD ($) $ in Millions	Mar. 28, 2021	Jun. 28, 2020
Inventory, Net [Abstract]
Raw material	$ 42.4	$ 36.9
Work-in-progress	90.2	73.9
Finished goods	14.9	11.1
Inventories	147.5	121.9
Inventory [Line Items]
Inventories	147.5	121.9
Operating Segments | Wolfspeed
Inventory, Net [Abstract]
Inventories	138.8	97.3
Inventory [Line Items]
Inventories	138.8	97.3
Operating Segments | Wafer Supply Agreement inventory
Inventory, Net [Abstract]
Inventories	0.0	19.0
Inventory [Line Items]
Inventories	0.0	19.0
Unallocated inventories
Inventory, Net [Abstract]
Inventories	8.7	5.6
Inventory [Line Items]
Inventories	$ 8.7	$ 5.6

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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