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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 27, 2015
Sep. 27, 2014
Fiscal 2014 charges:    
Restructuring Reserve [Roll Forward]    
Period beginning balance $ 16.9  
Fiscal 2015 restructuring charges   $ 46.2
Period end balance   16.9
Fiscal 2014 charges: | Consolidation of Diagnostics Operations    
Restructuring Reserve [Roll Forward]    
Period beginning balance 3.0  
Fiscal 2015 restructuring charges   3.0
Period end balance   3.0
Fiscal 2014 charges: | Fiscal 2015 Actions    
Restructuring Reserve [Roll Forward]    
Period beginning balance 0.0  
Fiscal 2015 restructuring charges   0.0
Period end balance   0.0
Fiscal 2014 charges: | Fiscal 2014 Actions    
Restructuring Reserve [Roll Forward]    
Period beginning balance 12.0  
Fiscal 2015 restructuring charges   29.5
Period end balance   12.0
Fiscal 2014 charges: | Other Operating Cost Reductions    
Restructuring Reserve [Roll Forward]    
Period beginning balance 1.9  
Fiscal 2015 restructuring charges   13.7
Period end balance   $ 1.9
Fiscal 2015 charges:    
Restructuring Reserve [Roll Forward]    
Fiscal 2015 restructuring charges 12.3  
Stock-based compensation (0.7)  
Fiscal 2015 charges: | Consolidation of Diagnostics Operations    
Restructuring Reserve [Roll Forward]    
Fiscal 2015 restructuring charges 0.6  
Fiscal 2015 charges: | Fiscal 2015 Actions    
Restructuring Reserve [Roll Forward]    
Fiscal 2015 restructuring charges 3.7  
Fiscal 2015 charges: | Fiscal 2014 Actions    
Restructuring Reserve [Roll Forward]    
Fiscal 2015 restructuring charges 7.7  
Fiscal 2015 charges: | Other Operating Cost Reductions    
Restructuring Reserve [Roll Forward]    
Fiscal 2015 restructuring charges 0.3  
Two Thousand Fifteen    
Restructuring Reserve [Roll Forward]    
Stock-based compensation (0.7)  
Severance payments (21.6)  
Other payments (1.8)  
Period end balance 5.1  
Two Thousand Fifteen | Consolidation of Diagnostics Operations    
Restructuring Reserve [Roll Forward]    
Stock-based compensation 0.0  
Severance payments (3.0)  
Other payments (0.5)  
Period end balance 0.1  
Two Thousand Fifteen | Fiscal 2015 Actions    
Restructuring Reserve [Roll Forward]    
Stock-based compensation (0.7)  
Severance payments (1.7)  
Other payments 0.0  
Period end balance 1.3  
Two Thousand Fifteen | Fiscal 2014 Actions    
Restructuring Reserve [Roll Forward]    
Stock-based compensation 0.0  
Severance payments (15.0)  
Other payments (1.0)  
Period end balance 3.7  
Two Thousand Fifteen | Other Operating Cost Reductions    
Restructuring Reserve [Roll Forward]    
Stock-based compensation 0.0  
Severance payments (1.9)  
Other payments (0.3)  
Period end balance $ 0.0