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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Jun. 28, 2025
Information on reportable segments      
Total net revenue $ 299.1 $ 238.2  
Cost of revenues 130.1 102.1  
Research and development 56.0 49.4  
Selling, general and administrative 104.2 74.1  
Total operating expenses 161.4 124.6  
Income from operations 7.6 11.5  
Unallocated other expenses 7.6 11.5  
Loss on convertible note extinguishment (3.8) 0.0  
Interest and other income, net 1.3 3.2  
Interest expense (7.4) (7.5)  
(Loss) income before income taxes and equity investment losses (2.3) 7.2  
Inventories, net 124.5 93.2 $ 117.9
Assets not allocated to segments 2,082.1 1,737.6 1,993.8
Total assets 2,082.1 1,737.6 $ 1,993.8
Product revenue      
Information on reportable segments      
Total net revenue 257.4 197.5  
Service revenue      
Information on reportable segments      
Total net revenue 41.7 40.7  
Operating Segments      
Information on reportable segments      
Total net revenue 299.1 238.2  
Cost of revenues  
Research and development  
Selling, general and administrative  
Other segment items  
Total operating expenses  
Income from operations 47.1 23.9  
Unallocated other expenses 47.1 23.9  
Operating Segments | Product revenue      
Information on reportable segments      
Total net revenue 257.4 197.5  
Operating Segments | Service revenue      
Information on reportable segments      
Total net revenue 41.7 40.7  
Operating Segments | Network and Service Enablement      
Information on reportable segments      
Total net revenue 216.0 159.4  
Cost of revenues 79.9 62.3  
Research and development 48.9 42.1  
Selling, general and administrative 43.5 37.4  
Other segment items 27.4 24.9  
Total operating expenses 119.8 104.4  
Income from operations $ 16.3 $ (7.3)  
Operating margin (percent) 7.50% (4.60%)  
Unallocated other expenses $ 16.3 $ (7.3)  
Inventories, net 82.0 49.2  
Operating Segments | Network and Service Enablement | Product revenue      
Information on reportable segments      
Total net revenue 174.3 118.7  
Operating Segments | Network and Service Enablement | Service revenue      
Information on reportable segments      
Total net revenue 41.7 40.7  
Operating Segments | Optical Security and Performance Products      
Information on reportable segments      
Total net revenue 83.1 78.8  
Cost of revenues 39.6 35.2  
Research and development 3.9 4.7  
Selling, general and administrative 6.2 5.6  
Other segment items 2.6 2.1  
Total operating expenses 12.7 12.4  
Income from operations $ 30.8 $ 31.2  
Operating margin (percent) 37.10% 39.60%  
Unallocated other expenses $ 30.8 $ 31.2  
Inventories, net 42.5 44.0  
Operating Segments | Optical Security and Performance Products | Product revenue      
Information on reportable segments      
Total net revenue 83.1 78.8  
Operating Segments | Optical Security and Performance Products | Service revenue      
Information on reportable segments      
Total net revenue 0.0 0.0  
Other Items      
Information on reportable segments      
Income from operations (39.5) 12.4  
Unallocated other expenses (39.5) 12.4  
Assets not allocated to segments 1,957.6 1,644.4  
Total assets $ 1,957.6 $ 1,644.4