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Financial Statement Details - Inventories (Details) - USD ($) $ in Millions	Dec. 27, 2020	Jun. 28, 2020
Inventory, Net [Abstract]
Raw material	$ 43.5	$ 36.9
Work-in-progress	85.8	73.9
Finished goods	15.0	11.1
Inventories	144.3	121.9
Inventory [Line Items]
Inventories	144.3	121.9
Operating Segments | Wolfspeed Segment
Inventory, Net [Abstract]
Inventories	116.4	97.3
Inventory [Line Items]
Inventories	116.4	97.3
Operating Segments | Inventory related to future Wafer Supply Agreement
Inventory, Net [Abstract]
Inventories	17.1	19.0
Inventory [Line Items]
Inventories	17.1	19.0
Unallocated inventories
Inventory, Net [Abstract]
Inventories	10.8	5.6
Inventory [Line Items]
Inventories	$ 10.8	$ 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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