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Goodwill - Changes in Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jul. 02, 2022
Changes in goodwill      
Balance at the beginning of the period $ 455.2 $ 387.6  
Acquisitions   60.0  
Measurement period adjustment   (0.5)  
Currency translation (1.3) 8.1  
Other adjustment (1.0)    
Balance at the end of the period 452.9 455.2 $ 387.6
Network Enablement      
Changes in goodwill      
Balance at the beginning of the period 399.2 332.8  
Acquisitions   60.0  
Measurement period adjustment   (0.5)  
Currency translation (1.1) 6.9  
Other adjustment 0.0    
Balance at the end of the period 398.1 399.2 332.8
Goodwill transfers     1.2
Goodwill balance 700.0 701.1 634.7
Accumulated impairment losses 301.9 301.9 301.9
Service Enablement      
Changes in goodwill      
Balance at the beginning of the period 13.8 12.6  
Acquisitions   0.0  
Measurement period adjustment   0.0  
Currency translation (0.2) 1.2  
Other adjustment (1.0)    
Balance at the end of the period 12.6 13.8 12.6
Goodwill transfers     (1.2)
Goodwill balance 285.2 286.4 285.2
Accumulated impairment losses 272.6 272.6 272.6
Optical Security and Performance Products      
Changes in goodwill      
Balance at the beginning of the period 42.2 42.2  
Acquisitions   0.0  
Measurement period adjustment   0.0  
Currency translation 0.0 0.0  
Other adjustment 0.0    
Balance at the end of the period 42.2 42.2 42.2
Goodwill balance 126.7 126.7 126.7
Accumulated impairment losses $ 84.5 $ 84.5 $ 84.5