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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Dec. 28, 2013
Jun. 27, 2015
Jun. 28, 2014
Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]            
Fiscal restructuring and divestiture charges $ 11.9 $ 6.7   $ 21.9 $ 36.6  
Fiscal 2014 Actions            
Restructuring Cost and Reserve [Line Items]            
Facility closure costs $ 1.4     1.6    
Restructuring | Fiscal 2014 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions           $ 42.2
Non-cash impairment charge           3.1
Facility closure costs           0.6
Other           0.3
Fiscal restructuring charges           46.2
Divestiture net charges           5.5
Fiscal restructuring and divestiture charges           51.7
Restructuring | Fiscal 2015 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions       10.1    
Facility closure costs       2.2    
Fiscal restructuring charges       12.3    
Divestiture net charges       9.6    
Fiscal restructuring and divestiture charges       21.9    
Restructuring | Consolidation of Diagnostics Operations | Fiscal 2014 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions           2.9
Non-cash impairment charge           0.0
Facility closure costs           0.0
Other           0.1
Fiscal restructuring charges           3.0
Restructuring | Consolidation of Diagnostics Operations | Fiscal 2015 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions       0.1    
Facility closure costs       0.5    
Fiscal restructuring charges       0.6    
Restructuring | Fiscal 2015 Actions | Fiscal 2014 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions           0.0
Non-cash impairment charge           0.0
Facility closure costs           0.0
Other           0.0
Fiscal restructuring charges           0.0
Restructuring | Fiscal 2015 Actions | Fiscal 2015 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions       3.7    
Facility closure costs       0.0    
Fiscal restructuring charges       3.7    
Restructuring | Fiscal 2014 Actions | Fiscal 2014 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions           29.5
Non-cash impairment charge           0.0
Facility closure costs           0.0
Other           0.0
Fiscal restructuring charges           29.5
Restructuring | Fiscal 2014 Actions | Fiscal 2015 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions       6.1    
Facility closure costs       1.6    
Fiscal restructuring charges       7.7    
Restructuring | Other Operating Cost Reductions | Fiscal 2014 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions           9.8
Non-cash impairment charge     $ 3.1     3.1
Facility closure costs           0.6
Other           0.2
Fiscal restructuring charges           $ 13.7
Restructuring | Other Operating Cost Reductions | Fiscal 2015 charges:            
Restructuring Cost and Reserve [Line Items]            
Workforce reductions       0.2    
Facility closure costs       0.1    
Fiscal restructuring charges       $ 0.3