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Reportable Segments - Inventory by Reportable Segment (Details) - USD ($)
$ in Millions
Dec. 29, 2019
Jun. 30, 2019
Segment Reporting Information [Line Items]    
Inventories $ 165.3 $ 187.4
Operating Segments    
Segment Reporting Information [Line Items]    
Inventories 160.8 180.8
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Inventories 4.5 6.6
Wolfspeed | Operating Segments    
Segment Reporting Information [Line Items]    
Inventories 84.6 81.6
LED Products | Operating Segments    
Segment Reporting Information [Line Items]    
Inventories $ 76.2 $ 99.2