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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended
Oct. 02, 2021
USD ($)
segment
Oct. 03, 2020
USD ($)
Information on reportable segments    
Number of broad business categories (in segment) | segment 2  
Total net revenue $ 326.8 $ 284.7
Gross profit $ 195.0 $ 169.4
Gross margin (as a percent) 59.70% 59.50%
Operating income $ 46.9 $ 31.3
Operating margin (as a percent) 14.40% 11.00%
Other Items    
Information on reportable segments    
Total net revenue $ 0.0 $ 0.0
Gross profit (9.5) (9.4)
Operating income (27.4) (29.3)
Network and Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 227.9 183.5
Gross profit $ 147.4 $ 117.8
Gross margin (as a percent) 64.70% 64.20%
Operating income $ 30.7 $ 13.3
Operating margin (as a percent) 13.50% 7.20%
Network and Service Enablement | Network Enablement | Segment Measures    
Information on reportable segments    
Total net revenue $ 204.9 $ 162.1
Gross profit $ 132.7 $ 103.5
Gross margin (as a percent) 64.80% 63.80%
Network and Service Enablement | Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue $ 23.0 $ 21.4
Gross profit $ 14.7 $ 14.3
Gross margin (as a percent) 63.90% 66.80%
Optical Security and Performance Products | Segment Measures    
Information on reportable segments    
Total net revenue $ 98.9 $ 101.2
Gross profit $ 57.1 $ 61.0
Gross margin (as a percent) 57.70% 60.30%
Operating income $ 43.6 $ 47.3
Operating margin (as a percent) 44.10% 46.70%
Product revenue    
Information on reportable segments    
Total net revenue $ 289.1 $ 247.9
Product revenue | Other Items    
Information on reportable segments    
Total net revenue 0.0 0.0
Product revenue | Network and Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 190.5 146.9
Product revenue | Network and Service Enablement | Network Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 179.6 139.2
Product revenue | Network and Service Enablement | Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 10.9 7.7
Product revenue | Optical Security and Performance Products | Segment Measures    
Information on reportable segments    
Total net revenue 98.6 101.0
Service revenue    
Information on reportable segments    
Total net revenue 37.7 36.8
Service revenue | Other Items    
Information on reportable segments    
Total net revenue 0.0 0.0
Service revenue | Network and Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 37.4 36.6
Service revenue | Network and Service Enablement | Network Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 25.3 22.9
Service revenue | Network and Service Enablement | Service Enablement | Segment Measures    
Information on reportable segments    
Total net revenue 12.1 13.7
Service revenue | Optical Security and Performance Products | Segment Measures    
Information on reportable segments    
Total net revenue $ 0.3 $ 0.2