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Goodwill (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Dec. 30, 2017
Changes in goodwill    
Balance at the beginning of the period   $ 151,600,000
Goodwill - Trilithic   17,800,000
Currency translation adjustments   1,300,000
Balance at the end of the period $ 151,600,000 170,700,000
Network Enablement    
Changes in goodwill    
Balance at the beginning of the period   143,300,000
Goodwill - Trilithic   17,800,000
Currency translation adjustments   1,300,000
Balance at the end of the period 143,300,000 162,400,000
Goodwill impairment 0  
Optical Security and Performance Products    
Changes in goodwill    
Balance at the beginning of the period   8,300,000
Goodwill - Trilithic   0
Currency translation adjustments   0
Balance at the end of the period 8,300,000 $ 8,300,000
Goodwill impairment $ 0