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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Apr. 01, 2023
USD ($)
Apr. 02, 2022
USD ($)
Apr. 01, 2023
USD ($)
segment
Apr. 02, 2022
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Total net revenue $ 247.8 $ 315.5 $ 842.5 $ 957.1
Gross profit $ 141.0 $ 186.9 $ 492.8 $ 572.4
Gross margin (as a percent) 56.90% 59.20% 58.50% 59.80%
Operating income $ (2.1) $ 40.8 $ 70.6 $ 137.0
Operating margin (as a percent) (0.80%) 12.90% 8.40% 14.30%
Other Items        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0
Gross profit (7.0) (8.7) (22.5) (26.8)
Operating income (30.4) (26.9) (71.1) (78.3)
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 177.3 230.8 603.3 702.9
Gross profit $ 112.3 $ 148.6 $ 387.3 $ 455.4
Gross margin (as a percent) 63.30% 64.40% 64.20% 64.80%
Operating income $ 2.5 $ 34.4 $ 49.8 $ 110.7
Operating margin (as a percent) 1.40% 14.90% 8.30% 15.70%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 149.6 $ 204.3 $ 524.2 $ 623.6
Gross profit $ 92.8 $ 130.3 $ 333.5 $ 401.0
Gross margin (as a percent) 62.00% 63.80% 63.60% 64.30%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 27.7 $ 26.5 $ 79.1 $ 79.3
Gross profit $ 19.5 $ 18.3 $ 53.8 $ 54.4
Gross margin (as a percent) 70.40% 69.10% 68.00% 68.60%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 70.5 $ 84.7 $ 239.2 $ 254.2
Gross profit $ 35.7 $ 47.0 $ 128.0 $ 143.8
Gross margin (as a percent) 50.60% 55.50% 53.50% 56.60%
Operating income $ 25.8 $ 33.3 $ 91.9 $ 104.6
Operating margin (as a percent) 36.60% 39.30% 38.40% 41.10%
Product revenue        
Information on reportable segments        
Total net revenue $ 205.2 $ 275.8 $ 714.4 $ 842.3
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 134.7 191.2 475.3 588.5
Product revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 121.9 176.7 438.4 545.9
Product revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 12.8 14.5 36.9 42.6
Product revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue 70.5 84.6 239.1 253.8
Service revenue        
Information on reportable segments        
Total net revenue 42.6 39.7 128.1 114.8
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 42.6 39.6 128.0 114.4
Service revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 27.7 27.6 85.8 77.7
Service revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 14.9 12.0 42.2 36.7
Service revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.1 $ 0.1 $ 0.4