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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2010
Sep. 27, 2015
Sep. 28, 2014
Dec. 28, 2014
Income Tax Disclosure [Abstract]        
Federal annual utilization of NOL carryforwards limit, next five years $ 27.0      
Threshold period for change in allowed annual amount of NOL to be recognized 5 years      
Federal annual utilization of NOL carryforwards limit, after year five $ 11.6      
Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations       $ 16.1
Unrecognized tax benefits increase (decrease)   $ 0.3    
Income Tax Contingency [Line Items]        
Unrecognized tax benefits related to discontinued operations       $ 0.3
Expense for interest and penalties   0.2 $ 0.1  
Herley        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits related to discontinued operations   $ 0.3