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Balance Sheet Details - Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 30, 2019
Mar. 30, 2019
Mar. 31, 2018
Jun. 30, 2018
Jul. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Finished goods $ 94.9 $ 94.9   $ 98.2  
Work in process 121.3 121.3   34.5  
Raw materials and purchased parts 56.0 56.0   20.9  
Inventories 272.2 272.2   153.6 $ 152.4
Business Acquisition [Line Items]          
Inventory step-up adjustment   15.8 $ 0.0    
Oclaro          
Business Acquisition [Line Items]          
Inventory step-up adjustment 0.9 44.5   $ 60.3  
Product lines in Datacom business | Disposal group, not discontinued operations          
Business Acquisition [Line Items]          
Inventory, assets held-for-sale $ 5.1 $ 5.1