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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Apr. 02, 2016
Mar. 28, 2015
Stock-Based Compensation        
Stock-based compensation cost $ 8.2 $ 7.4 $ 21.0 $ 21.0
Stock-based compensation capitalized to inventory     0.9  
Viavi        
Stock-Based Compensation        
Stock-based compensation cost   2.9 0.5 6.8
Cost of sales        
Stock-Based Compensation        
Stock-based compensation cost 2.2 1.2 4.9 3.8
Research and development        
Stock-Based Compensation        
Stock-based compensation cost 2.5 1.9 6.7 5.6
Selling, general and administrative        
Stock-Based Compensation        
Stock-based compensation cost $ 3.5 $ 4.3 $ 9.4 $ 11.6