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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 30, 2017
USD ($)
subsegment
segment
Dec. 31, 2016
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Net revenue $ 201.8 $ 206.5 $ 397.0 $ 417.3
Gross profit $ 116.1 $ 124.7 $ 232.3 $ 249.8
Gross margin (as a percent) 57.50% 60.40% 58.50% 59.90%
Operating income $ 3.7 $ 6.7 $ 13.7 $ 16.8
Operating margin (as a percent) 1.80% 3.20% 3.50% 4.00%
Segment Measures        
Information on reportable segments        
Net revenue $ 201.8 $ 206.5 $ 397.0 $ 417.3
Gross profit $ 122.4 $ 129.9 $ 244.9 $ 260.2
Gross margin (as a percent) 60.70% 62.90% 61.70% 62.40%
Operating income $ 25.4 $ 26.9 $ 54.8 $ 54.4
Operating margin (as a percent) 12.60% 13.00% 13.80% 13.00%
Reconciling Items        
Information on reportable segments        
Net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0
Gross profit (6.3) (5.2) (12.6) (10.4)
Operating income (21.7) (20.2) $ (41.1) (37.6)
Network and Service Enablement        
Information on reportable segments        
Number of subsegments (in subsegment) | subsegment     2  
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Net revenue 153.6 157.6 $ 294.4 312.6
Gross profit $ 96.2 $ 101.7 $ 187.3 $ 200.4
Gross margin (as a percent) 62.60% 64.50% 63.60% 64.10%
Operating income $ 8.0 $ 6.0 $ 15.2 $ 10.1
Operating margin (as a percent) 5.20% 3.80% 5.20% 3.20%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Net revenue $ 121.5 $ 117.0 $ 233.3 $ 235.6
Gross profit $ 73.8 $ 74.6 $ 144.4 $ 152.0
Gross margin (as a percent) 60.70% 63.80% 61.90% 64.50%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Net revenue $ 32.1 $ 40.6 $ 61.1 $ 77.0
Gross profit $ 22.4 $ 27.1 $ 42.9 $ 48.4
Gross margin (as a percent) 69.80% 66.70% 70.20% 62.90%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Net revenue $ 48.2 $ 48.9 $ 102.6 $ 104.7
Gross profit $ 26.2 $ 28.2 $ 57.6 $ 59.8
Gross margin (as a percent) 54.40% 57.70% 56.10% 57.10%
Operating income $ 17.4 $ 20.9 $ 39.6 $ 44.3
Operating margin (as a percent) 36.10% 42.70% 38.60% 42.30%