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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 26, 2015
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 2.3  
Restructuring Reserve [Roll Forward]    
Severance payments (3.8)  
Other payments (0.1)  
Period end balance 4.1  
Two Thousand Sixteen [Member] | Restructuring Action Two Thousand Sixteen [Domain]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges Under Exit Or Disposal Plan 2.3  
Restructuring Reserve [Roll Forward]    
Severance payments 1.2  
Other payments 0.0  
Period end balance (1.1)  
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 (1.3)  
Other payments 0.0  
Period end balance 1.8  
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 1.2  
Other payments 0.1  
Period end balance (1.2)  
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