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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]      
Fiscal restructuring and divestiture charges $ 2.3 $ 8.0  
Restructuring | Two Thousand Fifteen [Member]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions     $ 16.3
Facility closure costs     2.6
Fiscal restructuring charges     18.9
Divestiture net charges     9.6
Fiscal restructuring and divestiture charges     28.5
Restructuring | Year Two Thousand Sixteen [Domain]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions 2.3    
Fiscal restructuring charges 2.3    
Restructuring | Fiscal 2016 Actions [Domain] | Two Thousand Fifteen [Member]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions     0.0
Facility closure costs     0.0
Fiscal restructuring charges     0.0
Restructuring | Fiscal 2016 Actions [Domain] | Year Two Thousand Sixteen [Domain]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions 2.3    
Fiscal restructuring charges 2.3    
Restructuring | Fiscal 2015 Actions | Two Thousand Fifteen [Member]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions     10.0
Facility closure costs     0.0
Fiscal restructuring charges     10.0
Restructuring | Fiscal 2015 Actions | Year Two Thousand Sixteen [Domain]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions 0.0    
Fiscal restructuring charges 0.0    
Restructuring | Fiscal 2014 Actions | Two Thousand Fifteen [Member]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions     6.0
Facility closure costs     2.0
Fiscal restructuring charges     8.0
Restructuring | Fiscal 2014 Actions | Year Two Thousand Sixteen [Domain]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions 0.0    
Fiscal restructuring charges 0.0    
Restructuring | Other Operating Cost Reductions | Two Thousand Fifteen [Member]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions     0.3
Facility closure costs     0.6
Fiscal restructuring charges     $ 0.9
Restructuring | Other Operating Cost Reductions | Year Two Thousand Sixteen [Domain]      
Restructuring Cost and Reserve [Line Items]      
Workforce reductions 0.0    
Fiscal restructuring charges $ 0.0