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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - Restructuring - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Apr. 01, 2017
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 $ 5.5  
Severance Costs 1.3  
Facility Closure Costs 3.5  
Fiscal restructuring charges 4.8  
Fiscal 2017 Actions [Member] | Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   0.0
Fiscal 2017 Actions [Member] | Year Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Reduction Of Workforce Expenses   0.0
Fiscal restructuring charges   0.0
Fiscal 2017 Actions [Member] | Two Thousand Seventeen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1.5  
Severance Costs 1.5  
Facility Closure Costs 0.0  
Fiscal restructuring charges 1.5  
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 3.6  
Severance Costs (0.2)  
Facility Closure Costs 3.5  
Fiscal restructuring charges 3.3  
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 0.0  
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 $ 0.4