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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2022
USD ($)
segment
Jan. 01, 2022
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Total net revenue $ 284.5 $ 314.8 $ 594.7 $ 641.6
Gross profit $ 167.0 $ 190.5 $ 351.8 $ 385.5
Gross margin (as a percent) 58.70% 60.50% 59.20% 60.10%
Operating income $ 22.9 $ 49.3 $ 72.7 $ 96.2
Operating margin (as a percent) 8.00% 15.70% 12.20% 15.00%
Other Items        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0
Gross profit (6.9) (8.6) (15.5) (18.1)
Operating income (23.1) (24.0) (40.7) (51.4)
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 207.1 244.2 426.0 472.1
Gross profit $ 133.4 $ 159.4 $ 275.0 $ 306.8
Gross margin (as a percent) 64.40% 65.30% 64.60% 65.00%
Operating income $ 18.5 $ 45.6 $ 47.3 $ 76.3
Operating margin (as a percent) 8.90% 18.70% 11.10% 16.20%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 179.7 $ 214.4 $ 374.6 $ 419.3
Gross profit $ 115.1 $ 138.0 $ 240.7 $ 270.7
Gross margin (as a percent) 64.10% 64.40% 64.30% 64.60%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue $ 27.4 $ 29.8 $ 51.4 $ 52.8
Gross profit $ 18.3 $ 21.4 $ 34.3 $ 36.1
Gross margin (as a percent) 66.80% 71.80% 66.70% 68.40%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 77.4 $ 70.6 $ 168.7 $ 169.5
Gross profit $ 40.5 $ 39.7 $ 92.3 $ 96.8
Gross margin (as a percent) 52.30% 56.20% 54.70% 57.10%
Operating income $ 27.5 $ 27.7 $ 66.1 $ 71.3
Operating margin (as a percent) 35.50% 39.20% 39.20% 42.10%
Product revenue        
Information on reportable segments        
Total net revenue $ 241.5 $ 277.4 $ 509.2 $ 566.5
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 164.1 206.8 340.6 397.3
Product revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 150.6 189.6 316.5 369.2
Product revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 13.5 17.2 24.1 28.1
Product revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue 77.4 70.6 168.6 169.2
Service revenue        
Information on reportable segments        
Total net revenue 43.0 37.4 85.5 75.1
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 43.0 37.4 85.4 74.8
Service revenue | Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 29.1 24.8 58.1 50.1
Service revenue | Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Total net revenue 13.9 12.6 27.3 24.7
Service revenue | Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Total net revenue $ 0.0 $ 0.0 $ 0.1 $ 0.3