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Goodwill - Changes in Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jul. 01, 2023
Changes in goodwill      
Balance at the beginning of the period $ 452.9 $ 455.2  
Acquisitions 129.7    
Currency translation 12.5 (1.3)  
Other adjustment 0.6 (1.0)  
Balance at the end of the period 595.7 452.9  
Network and Service Enablement      
Changes in goodwill      
Balance at the beginning of the period 410.7 413.0  
Acquisitions 129.7    
Currency translation 12.5 (1.3)  
Other adjustment 0.6 (1.0)  
Balance at the end of the period 553.5 410.7  
Goodwill balance 1,128.0 985.2 $ 987.5
Accumulated impairment losses 574.5 574.5 574.5
Optical Security and Performance Products      
Changes in goodwill      
Balance at the beginning of the period 42.2 42.2  
Acquisitions 0.0    
Currency translation 0.0 0.0  
Other adjustment 0.0 0.0  
Balance at the end of the period 42.2 42.2  
Goodwill balance 126.7 126.7 126.7
Accumulated impairment losses $ 84.5 $ 84.5 $ 84.5