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Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 02, 2016
Apr. 01, 2017
Changes in goodwill    
Balance at the beginning of the period   $ 152.1
Currency translation adjustments   (1.4)
Balance at the end of the period $ 152.1 150.7
Network Enablement    
Changes in goodwill    
Balance at the beginning of the period   143.8
Currency translation adjustments   (1.4)
Balance at the end of the period 143.8 142.4
Goodwill impairment 0.0  
Optical Security and Performance Products    
Changes in goodwill    
Balance at the beginning of the period   8.3
Currency translation adjustments   0.0
Balance at the end of the period 8.3 $ 8.3
Goodwill impairment 0.0  
Service Enablement    
Changes in goodwill    
Goodwill impairment $ 91.4