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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 29, 2025
USD ($)
Mar. 30, 2024
USD ($)
Mar. 29, 2025
USD ($)
segment
Mar. 30, 2024
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Total net revenue $ 284.8 $ 246.0 $ 793.8 $ 748.4
Gross profit $ 160.7 $ 137.9 $ 457.6 $ 430.3
Gross margin (as a percent) 56.40% 56.10% 57.60% 57.50%
Operating Income (Loss) $ 8.5 $ (11.9) $ 42.2 $ 26.5
Operating margin (as a percent) 3.00% (4.80%) 5.30% 3.50%
Segment Measures        
Information on reportable segments        
Gross profit $ 170.8 $ 142.5 $ 476.9 $ 444.3
Operating Income (Loss) 47.7 23.0 112.0 87.5
Other Items        
Information on reportable segments        
Total net revenue 0.0 0.0 0.0 0.0
Gross profit (10.1) (4.6) (19.3) (14.0)
Operating Income (Loss) (39.2) (34.9) (69.8) (61.0)
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 208.2 169.8 567.5 519.8
Gross profit $ 131.3 $ 104.3 $ 357.9 $ 326.4
Gross margin (as a percent) 63.10% 61.40% 63.10% 62.80%
Operating Income (Loss) $ 21.7 $ (3.1) $ 31.8 $ 4.8
Operating margin (as a percent) 10.40% (1.80%) 5.60% 0.90%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 188.0 $ 151.7 $ 508.6 $ 457.2
Gross profit $ 119.2 $ 93.3 $ 320.9 $ 285.1
Gross margin (as a percent) 63.40% 61.50% 63.10% 62.40%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 20.2 $ 18.1 $ 58.9 $ 62.6
Gross profit $ 12.1 $ 11.0 $ 37.0 $ 41.3
Gross margin (as a percent) 59.90% 60.80% 62.80% 66.00%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 76.6 $ 76.2 $ 226.3 $ 228.6
Gross profit $ 39.5 $ 38.2 $ 119.0 $ 117.9
Gross margin (as a percent) 51.60% 50.10% 52.60% 51.60%
Operating Income (Loss) $ 26.0 $ 26.1 $ 80.2 $ 82.7
Operating margin (as a percent) 33.90% 34.30% 35.40% 36.20%
Product revenue        
Information on reportable segments        
Total net revenue $ 241.5 $ 207.3 $ 664.7 $ 623.8
Product revenue | Other Items        
Information on reportable segments        
Total net revenue 0.0 0.0 0.0 0.0
Product revenue | Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 164.9 131.1 438.4 395.2
Product revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 156.0 124.0 415.5 369.6
Product revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 8.9 7.1 22.9 25.6
Product revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue 76.6 76.2 226.3 228.6
Service revenue        
Information on reportable segments        
Total net revenue 43.3 38.7 129.1 124.6
Service revenue | Other Items        
Information on reportable segments        
Total net revenue 0.0 0.0 0.0 0.0
Service revenue | Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 43.3 38.7 129.1 124.6
Service revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 32.0 27.7 93.1 87.6
Service revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 11.3 11.0 36.0 37.0
Service revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0