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Discontinued Operations - Statement of Operations (Details) - Spinoff - Lumentum - USD ($)
$ in Millions
 12 Months Ended 23 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jun. 27, 2015
Jul. 01, 2017
Discontinued Operations        
Net revenues $ 0.0 $ 66.5 $ 835.2  
Cost of revenues 0.0 49.8 569.1  
Amortization of acquired technologies 0.0 0.6 7.5  
Gross profit 0.0 16.1 258.6  
Operating expenses:        
Research and development 0.0 12.5 139.9  
Selling, general and administrative (0.8) 24.7 87.5  
Restructuring charges 0.0 0.1 7.7  
Total operating expenses (0.8) 37.3 235.1  
Income (loss) from operations 0.8 (21.2) 23.5  
Interest and other income, net 0.0 0.0 (1.1)  
Income (loss) before income taxes 0.8 (21.2) 22.4  
(Benefit from) provision for income taxes (0.8) 27.8 (20.9)  
Net income (loss) from discontinued operations $ 1.6 $ (49.0) $ 43.3 $ 0.0