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Restructuring and Divestiture Charges - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2015
USD ($)
Sep. 27, 2014
USD ($)
Jun. 28, 2014
USD ($)
Mar. 29, 2014
USD ($)
Dec. 28, 2013
USD ($)
employee
Jun. 27, 2015
USD ($)
offices
Jun. 28, 2014
USD ($)
Sep. 27, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]                
Loss on disposal of business   $ 5,300,000       $ 9,600,000 $ 0  
Restructuring Reserve, Translation and Other Adjustment $ 9,600,000              
Restructuring | Fiscal 2015 charges:                
Restructuring Cost and Reserve [Line Items]                
Severance charges 700,000         3,700,000    
Share Based Compensation Expense Included Other Restructuring Costs           700,000    
Workforce reductions           10,100,000    
Facility closure costs           2,200,000    
Restructuring | Fiscal 2014 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions               $ 42,200,000
Facility closure costs               600,000
Non-cash impairment charge               3,100,000
Consolidation of Diagnostics Operations | Molecular Diagnostics Operations                
Restructuring Cost and Reserve [Line Items]                
Severance charges     $ 600,000       $ 2,300,000 3,000,000
Severance and benefits and facility closure costs           600,000    
Consolidation of Diagnostics Operations | Restructuring | Fiscal 2015 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions           100,000    
Facility closure costs           500,000    
Consolidation of Diagnostics Operations | Restructuring | Fiscal 2014 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions               2,900,000
Facility closure costs               0
Non-cash impairment charge               0
Fiscal 2014 Actions                
Restructuring Cost and Reserve [Line Items]                
Severance charges 200,000   5,000,000 $ 3,000,000 $ 6,300,000 6,100,000   16,600,000
Compensation charges         400,000     1,800,000
Facility closure costs 1,400,000         $ 1,600,000    
Number Office Locations related to Facility Closure Costs | offices           2    
Fiscal 2014 Actions | Jack Cumming                
Restructuring Cost and Reserve [Line Items]                
Severance charges         6,600,000      
Compensation charges         4,400,000      
Fiscal 2014 Actions | Restructuring | Fiscal 2015 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions           $ 6,100,000    
Facility closure costs           1,600,000    
Fiscal 2014 Actions | Restructuring | Fiscal 2014 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions               29,500,000
Facility closure costs               0
Non-cash impairment charge               0
Other Operating Cost Reductions                
Restructuring Cost and Reserve [Line Items]                
Severance charges     $ 1,100,000 $ 7,300,000 $ 0     8,700,000
Number of employees affected for severance benefits | employee         95      
Estimated aggregate severance charges $ 9,300,000         9,300,000    
Other Operating Cost Reductions | Restructuring | Fiscal 2015 charges:                
Restructuring Cost and Reserve [Line Items]                
Severance and benefits and facility closure costs           300,000    
Workforce reductions           200,000    
Facility closure costs           $ 100,000    
Other Operating Cost Reductions | Restructuring | Fiscal 2014 charges:                
Restructuring Cost and Reserve [Line Items]                
Workforce reductions               9,800,000
Facility closure costs               600,000
Non-cash impairment charge         $ 3,100,000     $ 3,100,000