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Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Sep. 02, 2015
USD ($)
Jan. 07, 2015
USD ($)
Sep. 27, 2014
USD ($)
Customer
Mar. 29, 2014
USD ($)
Dec. 28, 2013
USD ($)
Jun. 29, 2013
USD ($)
Sep. 26, 2015
USD ($)
Customer
Sep. 27, 2014
USD ($)
Customer
Sep. 28, 2013
USD ($)
Significant Accounting Policies [Line Items]                  
Cash equivalent maturity period             three months or less    
Equity investment impairment charges             $ 7,800,000 $ 6,900,000 $ 6,400,000
Number of customers with balance greater than specified percentage | Customer     0       0 0  
Impairment charges on tangible assets         $ 3,100,000       6,300,000
Impairment charges on long lived assets       $ 28,600,000         3,700,000
Intangible assets useful life, minimum             2 years    
Intangible assets useful life, maximum             30 years    
Acquired In-process research and development charges     $ 5,100,000            
Sensitivity Change To Fair Value By Percent             10.00%    
Reporting unit's goodwill             $ 2,808,200,000    
Goodwill, Impairment Loss             $ 0 $ 0 1,117,400,000
Percentage of equity ownership at which cost-method investments would not qualify for cost-method accounting             20.00%    
Other-than-temporary impairment charges             $ 0 6,900,000 6,400,000
Sale of investment           $ 2,000,000      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax             17,400,000 0  
Interest Rate Cap Agreements Aggregate Premium Payable $ 7,100,000 $ 6,100,000         (13,200,000) 0 0
Principal Amount Of Borrowings             1,000,000,000    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred             $ 3,900,000    
Product Warranty Term             1 year    
Advertising cost             $ 14,400,000 $ 14,100,000 14,100,000
Molecular Diagnostics [Member]                  
Significant Accounting Policies [Line Items]                  
Goodwill, Impairment Loss                 $ 1,100,000,000
Percentage used to provide additional disclosure of potential goodwill impairment in the future                 10.00%
MRI Breast Coils [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges on tangible assets       28,600,000          
MRI Breast Coils [Member] | Property, Plant and Equipment [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges on long lived assets       1,500,000          
Developed Technology [Member] | MRI Breast Coils [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charge       26,600,000          
Trade Names [Member] | MRI Breast Coils [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charge       500,000          
Finite-Lived Intangible Assets [Member] | MRI Breast Coils [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges on long lived assets       27,100,000          
Minimum [Member]                  
Significant Accounting Policies [Line Items]                  
Defined contract term             3 years    
Minimum [Member] | Accounts receivable [Member]                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage             10.00% 10.00%  
Minimum [Member] | Total revenues [Member]                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage             10.00% 10.00% 10.00%
Maximum [Member]                  
Significant Accounting Policies [Line Items]                  
Defined contract term             5 years    
Cost of Sales [Member] | MRI Breast Coils [Member] | Property, Plant and Equipment [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges on long lived assets       300,000          
General and Administrative Expense [Member] | MRI Breast Coils [Member] | Property, Plant and Equipment [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges on long lived assets       $ 1,200,000          
Interest Rate Cap [Member]                  
Significant Accounting Policies [Line Items]                  
Interest Rate Cash Flow Hedge Asset at Fair Value             $ 6,900,000    
Foreign Currency Gain (Loss) [Member]                  
Significant Accounting Policies [Line Items]                  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax             9,600,000 $ 0  
Equity Securities [Member]                  
Significant Accounting Policies [Line Items]                  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax             $ 7,800,000 $ 0