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Goodwill - Changes in goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Changes in goodwill      
Balance at the beginning of the period $ 151.6 $ 152.1  
Acquisitions 190.1    
Currency translation and other adjustments (5.4) (0.5)  
Balance at the end of the period 336.3 151.6  
Goodwill balance 995.3 810.6  
Accumulated impairment losses 659.0 659.0  
Network Enablement      
Changes in goodwill      
Balance at the beginning of the period 143.3 143.8  
Acquisitions 190.1    
Currency translation and other adjustments (5.4) (0.5)  
Balance at the end of the period 328.0 143.3  
Goodwill balance 629.9 445.2 $ 445.7
Accumulated impairment losses 301.9 301.9 301.9
Service Enablement      
Changes in goodwill      
Balance at the beginning of the period 0.0 0.0  
Acquisitions 0.0    
Currency translation and other adjustments 0.0 0.0  
Balance at the end of the period 0.0 0.0  
Goodwill balance 272.6 272.6 272.6
Accumulated impairment losses 272.6 272.6 272.6
Optical Security and Performance Products      
Changes in goodwill      
Balance at the beginning of the period 8.3 8.3  
Acquisitions 0.0    
Balance at the end of the period 8.3 8.3  
Goodwill balance 92.8 92.8 92.8
Accumulated impairment losses $ 84.5 $ 84.5 $ 84.5