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Operating Segments and Geographic Information - Information on Reportable Segments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Dec. 31, 2016
USD ($)
subsegment
segment
Jan. 02, 2016
USD ($)
Information on reportable segments        
Number of broad business categories (in segment) | segment     2  
Net revenue $ 206.5 $ 232.1 $ 417.3 $ 461.8
Gross profit $ 124.7 $ 141.8 $ 249.8 $ 282.3
Gross margin (as a percent) 60.40% 61.10% 59.90% 61.10%
Operating income $ 6.7 $ 9.2 $ 16.8 $ 6.3
Operating margin (as a percent) 3.20% 4.00% 4.00% 1.40%
Segment Measures        
Information on reportable segments        
Net revenue $ 206.5 $ 232.1 $ 417.3 $ 461.8
Gross profit $ 129.9 $ 147.9 $ 260.2 $ 294.0
Gross margin (as a percent) 62.90% 63.70% 62.40% 63.70%
Operating income $ 26.9 $ 30.5 $ 54.4 $ 59.2
Operating margin (as a percent) 13.00% 13.10% 13.00% 12.80%
Reconciling Items        
Information on reportable segments        
Net revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0
Gross profit (5.2) (6.1) (10.4) (11.7)
Operating income (20.2) (21.3) $ (37.6) (52.9)
Network and Service Enablement        
Information on reportable segments        
Number of subsegment (in subsegment) | subsegment     2  
Network and Service Enablement | Segment Measures        
Information on reportable segments        
Net revenue 157.6 173.3 $ 312.6 338.8
Gross profit $ 101.7 $ 115.1 $ 200.4 $ 224.2
Gross margin (as a percent) 64.50% 66.40% 64.10% 66.20%
Operating income $ 6.0 $ 8.0 $ 10.1 $ 10.4
Operating margin (as a percent) 3.80% 4.60% 3.20% 3.10%
Network and Service Enablement | Network Enablement | Segment Measures        
Information on reportable segments        
Net revenue $ 117.0 $ 136.4 $ 235.6 $ 254.0
Gross profit $ 74.6 $ 90.6 $ 152.0 $ 166.3
Gross margin (as a percent) 63.80% 66.40% 64.50% 65.50%
Network and Service Enablement | Service Enablement | Segment Measures        
Information on reportable segments        
Net revenue $ 40.6 $ 36.9 $ 77.0 $ 84.8
Gross profit $ 27.1 $ 24.5 $ 48.4 $ 57.9
Gross margin (as a percent) 66.70% 66.40% 62.90% 68.30%
Optical Security and Performance Products | Segment Measures        
Information on reportable segments        
Net revenue $ 48.9 $ 58.8 $ 104.7 $ 123.0
Gross profit $ 28.2 $ 32.8 $ 59.8 $ 69.8
Gross margin (as a percent) 57.70% 55.80% 57.10% 56.70%
Operating income $ 20.9 $ 22.5 $ 44.3 $ 48.8
Operating margin (as a percent) 42.70% 38.30% 42.30% 39.70%