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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2015
Jul. 02, 2016
Apr. 02, 2016
Dec. 26, 2015
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jul. 02, 2016
Jun. 27, 2015
Jun. 28, 2014
Related Party Transaction [Line Items]                        
Research and development   $ 36.4 $ 35.3 $ 35.0 $ 34.4 $ 35.7 $ 35.0 $ 35.1 $ 35.0 $ 141.1 $ 140.8 $ 134.9
Transactions With Viavi                        
Related Party Transaction [Line Items]                        
Agreement contains purchase commitment $ 15.0                      
Revenue from related party                   3.3    
Research and development                   2.3    
Sublease rental income                   0.7    
Accounts receivable due from related party   $ 1.1               1.1    
Viavi | Transactions With Viavi                        
Related Party Transaction [Line Items]                        
Allocated costs                   11.7 87.9 64.7
Viavi | Transactions With Viavi | Research and development                        
Related Party Transaction [Line Items]                        
Allocated costs                   0.0 0.4 0.0
Viavi | Transactions With Viavi | Selling, general and administrative                        
Related Party Transaction [Line Items]                        
Allocated costs                   11.7 82.5 63.5
Viavi | Transactions With Viavi | Restructuring and related charges                        
Related Party Transaction [Line Items]                        
Allocated costs                   0.0 3.9 2.3
Viavi | Transactions With Viavi | Interest and other (income) expenses, net                        
Related Party Transaction [Line Items]                        
Allocated costs                   (0.1) 0.4 (1.3)
Viavi | Transactions With Viavi | Interest expense                        
Related Party Transaction [Line Items]                        
Allocated costs                   $ 0.1 $ 0.7 $ 0.2