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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - Restructuring - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 24, 2016
Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   $ 6.3
Year Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Reduction Of Workforce Expenses   10.5
Fiscal restructuring charges   10.5
Two Thousand Seventeen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve $ 5.4  
Severance Costs (0.3)  
Facility Closure Costs 3.5  
Fiscal restructuring charges 3.2  
Fiscal 2016 Actions [Domain] | Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   5.5
Fiscal 2016 Actions [Domain] | Year Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Reduction Of Workforce Expenses   10.5
Fiscal restructuring charges   10.5
Fiscal 2016 Actions [Domain] | Two Thousand Seventeen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 4.8  
Severance Costs (0.3)  
Facility Closure Costs 3.5  
Fiscal restructuring charges 3.2  
Fiscal 2015 Actions | Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   0.2
Fiscal 2015 Actions | Two Thousand Seventeen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.1  
Facility Closure Costs 0.0  
Fiscal 2014 Actions | Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   $ 0.6
Fiscal 2014 Actions | Two Thousand Seventeen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.5  
Facility Closure Costs $ 0.0