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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 26, 2016
Sep. 26, 2015
Two Thousand Fifteen    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan   $ 18.9
Restructuring Reserve [Roll Forward]    
Period beginning balance $ 5.7  
Period end balance   5.7
Two Thousand Fifteen | Restructuring Action Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan   0.0
Restructuring Reserve [Roll Forward]    
Period beginning balance 0.0  
Period end balance   0.0
Two Thousand Fifteen | Fiscal 2015 Actions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan   10.0
Restructuring Reserve [Roll Forward]    
Period beginning balance 3.1  
Period end balance   3.1
Two Thousand Fifteen | Fiscal 2014 Actions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan   8.0
Restructuring Reserve [Roll Forward]    
Period beginning balance 2.5  
Period end balance   2.5
Two Thousand Fifteen | Other Operating Cost Reductions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan   0.9
Restructuring Reserve [Roll Forward]    
Period beginning balance 0.1  
Period end balance   $ 0.1
Two Thousand Sixteen [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 6.0  
Restructuring Reserve [Roll Forward]    
Severance payments 6.2  
Other payments 0.2  
Period end balance 5.3  
Two Thousand Sixteen [Member] | Restructuring Action Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 6.0  
Restructuring Reserve [Roll Forward]    
Severance payments 2.3  
Other payments 0.0  
Period end balance 3.7  
Two Thousand Sixteen [Member] | Fiscal 2015 Actions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 0.0  
Restructuring Reserve [Roll Forward]    
Severance payments 2.4  
Other payments 0.0  
Period end balance 0.7  
Two Thousand Sixteen [Member] | Fiscal 2014 Actions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 0.0  
Restructuring Reserve [Roll Forward]    
Severance payments 1.4  
Other payments 0.2  
Period end balance 0.9  
Two Thousand Sixteen [Member] | Other Operating Cost Reductions    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 0.0  
Restructuring Reserve [Roll Forward]    
Severance payments 0.1  
Other payments 0.0  
Period end balance $ 0.0