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Restructuring and Divestiture Charges - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 24, 2016
Dec. 26, 2015
Sep. 24, 2016
Bedford [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance charges $ 0.0   $ 0.5 $ 1.7
Facility Closure Costs $ 3.5      
Restructuring | San Diego [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance charges   $ 0.9    
Restructuring | International [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance charges     $ 1.8 7.9
Allocated Share-based Compensation Expense       $ 0.4