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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 30, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Total net revenue $ 254.5 $ 284.5 $ 502.4 $ 594.7
Gross profit $ 148.0 $ 167.0 $ 292.4 $ 351.8
Gross margin (as a percent) 58.20% 58.70% 58.20% 59.20%
Operating income $ 22.4 $ 22.9 $ 38.4 $ 72.7
Operating margin (as a percent) 8.80% 8.00% 7.60% 12.20%
Segment Measures        
Information on reportable segments        
Gross profit $ 152.8 $ 173.9 $ 301.8 $ 367.3
Operating income 33.7 46.0 64.5 113.4
Other Items        
Information on reportable segments        
Total net revenue 0.0 0.0 0.0 0.0
Gross profit (4.8) (6.9) (9.4) (15.5)
Operating income (11.3) (23.1) (26.1) (40.7)
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 179.6 207.1 350.0 426.0
Gross profit $ 113.8 $ 133.4 $ 222.1 $ 275.0
Gross margin (as a percent) 63.40% 64.40% 63.50% 64.60%
Operating income $ 6.4 $ 18.5 $ 7.9 $ 47.3
Operating margin (as a percent) 3.60% 8.90% 2.30% 11.10%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 155.5 $ 183.3 $ 305.5 $ 379.8
Gross profit $ 97.2 $ 118.1 $ 191.8 $ 244.9
Gross margin (as a percent) 62.50% 64.40% 62.80% 64.50%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 24.1 $ 23.8 $ 44.5 $ 46.2
Gross profit $ 16.6 $ 15.3 $ 30.3 $ 30.1
Gross margin (as a percent) 68.90% 64.30% 68.10% 65.20%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 74.9 $ 77.4 $ 152.4 $ 168.7
Gross profit $ 39.0 $ 40.5 $ 79.7 $ 92.3
Gross margin (as a percent) 52.10% 52.30% 52.30% 54.70%
Operating income $ 27.3 $ 27.5 $ 56.6 $ 66.1
Operating margin (as a percent) 36.40% 35.50% 37.10% 39.20%
Product revenue        
Information on reportable segments        
Total net revenue $ 210.9 $ 241.5 $ 416.5 $ 509.2
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 136.0 164.1 264.1 340.6
Product revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 125.2 152.6 245.6 318.9
Product revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 10.8 11.5 18.5 21.7
Product revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue 74.9 77.4 152.4 168.6
Service revenue        
Information on reportable segments        
Total net revenue 43.6 43.0 85.9 85.5
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 43.6 43.0 85.9 85.4
Service revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 30.3 30.7 59.9 60.9
Service revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 13.3 12.3 26.0 24.5
Service revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.1