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Operating Segments and Geographic Information - Summary of Reportable Segments (Details)
$ in Millions
 12 Months Ended
Jun. 29, 2024
USD ($)
segment
Jul. 01, 2023
USD ($)
Jul. 02, 2022
USD ($)
Information on reportable segments      
Number of broad business categories (segment) | segment 2    
Net revenue $ 1,000.4 $ 1,106.1 $ 1,292.4
GAAP gross profit $ 575.9 $ 638.8 $ 773.5
Gross margin (percent) 57.60% 57.80% 59.80%
Operating income $ 20.8 $ 82.4 $ 185.0
Operating margin (percent) 2.10% 7.40% 14.30%
Segment Enablement      
Information on reportable segments      
GAAP gross profit $ 594.5 $ 668.8 $ 808.7
Operating income 115.0 172.5 286.8
Other Items      
Information on reportable segments      
Net revenue 0.0 0.0 0.0
GAAP gross profit (18.6) (30.0) (35.2)
Operating income (94.2) (90.1) (101.8)
Network and Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 702.0 801.2 949.1
GAAP gross profit $ 439.6 $ 510.2 $ 615.1
Gross margin (percent) 62.60% 63.70% 64.80%
Operating income $ 8.0 $ 61.2 $ 147.8
Operating margin (percent) 1.10% 7.60% 15.60%
Network and Service Enablement | Network Enablement | Segment Enablement      
Information on reportable segments      
Net revenue $ 615.7 $ 707.2 $ 855.7
GAAP gross profit $ 382.3 $ 447.6 $ 550.8
Gross margin (percent) 62.10% 63.30% 64.40%
Network and Service Enablement | Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue $ 86.3 $ 94.0 $ 93.4
GAAP gross profit $ 57.3 $ 62.6 $ 64.3
Gross margin (percent) 66.40% 66.60% 68.80%
Optical Security and Performance Products | Segment Enablement      
Information on reportable segments      
Net revenue $ 298.4 $ 304.9 $ 343.3
GAAP gross profit $ 154.9 $ 158.6 $ 193.6
Gross margin (percent) 51.90% 52.00% 56.40%
Operating income $ 107.0 $ 111.3 $ 139.0
Operating margin (percent) 35.90% 36.50% 40.50%
Product      
Information on reportable segments      
Net revenue $ 834.8 $ 936.1 $ 1,135.5
Product | Other Items      
Information on reportable segments      
Net revenue 0.0 0.0 0.0
Product | Network and Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 536.4 631.3 792.7
Product | Network and Service Enablement | Network Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 499.1 588.1 745.1
Product | Network and Service Enablement | Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 37.3 43.2 47.6
Product | Optical Security and Performance Products | Segment Enablement      
Information on reportable segments      
Net revenue 298.4 304.8 342.8
Service      
Information on reportable segments      
Net revenue 165.6 170.0 156.9
Service | Other Items      
Information on reportable segments      
Net revenue 0.0 0.0 0.0
Service | Network and Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 165.6 169.9 156.4
Service | Network and Service Enablement | Network Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 116.6 119.1 110.6
Service | Network and Service Enablement | Service Enablement | Segment Enablement      
Information on reportable segments      
Net revenue 49.0 50.8 45.8
Service | Optical Security and Performance Products | Segment Enablement      
Information on reportable segments      
Net revenue $ 0.0 $ 0.1 $ 0.5