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Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Sep. 24, 2016
USD ($)
Customer
Mar. 26, 2016
USD ($)
Dec. 26, 2015
USD ($)
Sep. 26, 2015
USD ($)
Customer
Sep. 27, 2014
USD ($)
Mar. 29, 2014
USD ($)
Dec. 28, 2013
USD ($)
Sep. 24, 2016
USD ($)
Customer
Sep. 26, 2015
USD ($)
Customer
Sep. 27, 2014
USD ($)
Jun. 25, 2016
USD ($)
Significant Accounting Policies [Line Items]                      
Cash equivalent maturity period               three months or less      
Equity investment impairment charges               $ (1,100,000) $ (7,800,000) $ (6,900,000)  
Number of customers with balance greater than specified percentage | Customer 0     0       0 0    
Impairment charges on tangible assets             $ 3,100,000        
Impairment charges on long lived assets           $ 28,600,000          
Acquired In-process research and development charges         $ 5,100,000            
Accumulated Amortization $ 2,681,500,000     $ 2,299,600,000       $ 2,681,500,000 $ 2,299,600,000    
Indefinite-lived Intangible Assets Acquired   $ 4,800,000                  
Sensitivity Change To Fair Value By Percent               10.00%      
Goodwill 2,803,100,000     2,808,200,000       $ 2,803,100,000 2,808,200,000    
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  
Gross Unrealized Gains       7,200,000         7,200,000    
Interest Rate Cap Agreements Aggregate Premium Payable               $ 0 13,200,000 0  
Principal Amount Of Borrowings 1,000,000,000             $ 1,000,000,000      
Interest Payment Duration               three-year      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax               $ 3,900,000 0 0  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred               6,900,000      
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments               1,500,000      
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax               1,100,000      
Notional Amount 165,000,000             $ 165,000,000      
Product Warranty Term               1 year      
Advertising cost               $ 20,200,000 14,400,000 $ 14,100,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax               (2,200,000) 17,400,000    
Debt [Member]                      
Significant Accounting Policies [Line Items]                      
Debt Issuance Cost                 27,600,000    
Other Current Assets [Member]                      
Significant Accounting Policies [Line Items]                      
Debt Issuance Cost                 600,000    
Other Noncurrent Assets [Member]                      
Significant Accounting Policies [Line Items]                      
Debt Issuance Cost                 27,000,000    
MRI Breast Coils [Member]                      
Significant Accounting Policies [Line Items]                      
Impairment charges on tangible assets           28,600,000          
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 9,600,000    
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]                      
Significant Accounting Policies [Line Items]                      
Accumulated Amortization 1,991,600,000     1,698,500,000       1,991,600,000 1,698,500,000    
Developed Technology [Member] | MRI Breast Coils [Member]                      
Significant Accounting Policies [Line Items]                      
Impairment charge           26,600,000          
Developed Technology [Member] | Cystic Fibrosis [Member]                      
Significant Accounting Policies [Line Items]                      
Accumulated Amortization                     $ 6,200,000
Trade Names [Member]                      
Significant Accounting Policies [Line Items]                      
Accumulated Amortization 141,600,000     131,500,000       $ 141,600,000 $ 131,500,000    
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]                      
Intangible assets useful life               2 years      
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]                      
Intangible assets useful life               30 years      
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 1,400,000     6,900,000       $ 1,400,000 $ 6,900,000    
Equity Securities [Member]                      
Significant Accounting Policies [Line Items]                      
Gross Unrealized Gains 0       $ 10,200,000     0   $ 10,200,000  
Equity Securities [Member]                      
Significant Accounting Policies [Line Items]                      
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments     $ (25,100,000)                
Equity investment impairment charges $ 1,100,000     $ 7,800,000              
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (7,800,000)    
Pension in Accumulated Other Comprehensive Income [Member]                      
Significant Accounting Policies [Line Items]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax               0 0    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                      
Significant Accounting Policies [Line Items]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax               $ 0 $ 9,600,000