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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 27, 2014
Customer
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Customer
Jun. 29, 2013
Dec. 29, 2012
Sep. 29, 2012
Sep. 27, 2014
Customer
Sep. 28, 2013
Customer
Sep. 29, 2012
Significant Accounting Policies [Line Items]                    
Cash equivalent maturity period                 three months or less  
Number of customers with balance greater than specified percentage 0     0       0 0  
Impairment charges on tangible assets     $ 3,100,000           $ 6,300,000 $ 19,500,000
Impairment charges on long lived assets   28,600,000   700,000         3,700,000 6,500,000
Intangible assets useful life, minimum               2 years    
Intangible assets useful life, maximum               30 years    
Acquired In-process research and development charges 5,100,000           4,500,000      
Discount rate assumption for fair value measurement of reporting unit           10.00%   10.00%   10.00%
Impairment of goodwill       1,100,000,000     5,800,000 0 1,117,400,000 5,800,000
Additional impairment charge   28,600,000                
Percentage of equity ownership at which cost-method investments would not qualify for cost-method accounting               20.00%    
Other-than-temporary impairment charges               6,900,000 6,400,000 0
Sale of investment         2,000,000          
Product Warranty Term               1 year    
Advertising cost               14,100,000 14,100,000 29,800,000
Gen-Probe Incorporated [Member]
                    
Significant Accounting Policies [Line Items]                    
In-process research and development assets       117,000,000     227,000,000   117,000,000 227,000,000
IPR&D Projects 4           6 4   6
In-process research and development, value 94,000,000             94,000,000    
Expected number of years for project completion               3 years    
Molecular Diagnostics [Member]
                    
Significant Accounting Policies [Line Items]                    
Discount rate assumption for fair value measurement of reporting unit                 10.00%  
Impairment of goodwill                 1,100,000,000  
Percentage used to provide additional disclosure of potential goodwill impairment in the future                 10.00%  
Additional impairment charge                 195,400,000  
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                
Other reporting units [Member]
                    
Significant Accounting Policies [Line Items]                    
Reporting unit's goodwill               2,610,000,000    
Diagnostics [Member]
                    
Significant Accounting Policies [Line Items]                    
Impairment of goodwill               0    
Reporting unit's goodwill               202,800,000    
Developed Technology [Member]
                    
Significant Accounting Policies [Line Items]                    
Impairment charge         1,700,000          
Developed Technology [Member] | Gen-Probe Incorporated [Member]
                    
Significant Accounting Policies [Line Items]                    
Intangible assets from business acquisition       1,700,000,000     1,570,000,000   1,700,000,000 1,570,000,000
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