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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Apr. 01, 2017
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Dec. 31, 2016
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Sep. 24, 2016
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Customer
Mar. 26, 2016
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Dec. 26, 2015
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Sep. 26, 2015
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Sep. 30, 2018
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Sep. 30, 2017
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Customer
Sep. 24, 2016
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Customer
Sep. 26, 2015
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Jul. 02, 2017
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Jul. 01, 2017
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Apr. 07, 2017
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Mar. 22, 2017
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Jun. 25, 2016
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Significant Accounting Policies [Line Items]                              
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense               $ 10,300,000              
Marketable Securities, Unrealized Gain (Loss)   $ 4,000,000                          
Cash equivalent maturity period               three months or less              
Net (gains) losses reclassified from accumulated other comprehensive income to the statement of income         $ 7,200,000     $ 2,400,000 $ 6,100,000 $ 0          
Equity investment impairment charges               $ 0 $ 1,100,000 7,800,000          
Number of customers with balance greater than specified percentage | Customer     0         0 0            
Accumulated Amortization     $ 2,681,500,000         $ 2,742,100,000 $ 2,681,500,000            
Indefinite-lived Intangible Assets Acquired       $ 4,800,000                      
Sensitivity Change To Fair Value By Percent               10.00%              
Goodwill     2,803,100,000         $ 3,171,200,000 2,803,100,000            
Other-than-temporary impairment charges                 0            
Purchase of interest rate caps               1,900,000 0 13,200,000          
Principal amount of borrowings               1,000,000,000              
Loss reclassified from accumulated other comprehensive income to the statement of operations, net               6,900,000 3,900,000 0          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred               3,600,000              
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments               3,100,000 1,500,000            
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax               3,600,000 1,100,000            
Notional Amount               $ 209,000,000              
Product Warranty Term               1 year              
Advertising cost               $ 22,500,000 20,200,000 14,400,000          
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax               4,500,000 (2,200,000)            
Increase to cash flows provided by operations               8,300,000 798,200,000 796,800,000          
Increase to cash flows used in financing activities               (285,800,000) 68,400,000 $ 86,100,000          
MRI Breast Coils [Member]                              
Significant Accounting Policies [Line Items]                              
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 9,600,000            
Developed Technology Rights [Member]                              
Significant Accounting Policies [Line Items]                              
Accumulated Amortization     1,991,600,000         2,186,800,000 1,991,600,000            
Developed Technology Rights [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         $ 156,400,000 $ 141,600,000            
Minimum                              
Significant Accounting Policies [Line Items]                              
Intangible assets useful life               2 years              
Defined contract term               3 years              
Transition services agreement term 2 years                            
Minimum | Accounts receivable [Member]                              
Significant Accounting Policies [Line Items]                              
Concentration risk, percentage               10.00% 10.00%            
Minimum | Total revenues [Member]                              
Significant Accounting Policies [Line Items]                              
Concentration risk, percentage               10.00% 10.00% 10.00%          
Maximum                              
Significant Accounting Policies [Line Items]                              
Intangible assets useful life               30 years              
Defined contract term               5 years              
Transition services agreement term 3 years                            
Other Nonoperating Income (Expense) [Member]                              
Significant Accounting Policies [Line Items]                              
Gain on Sale of Investments $ 3,800,000                            
Interest Rate Cap [Member]                              
Significant Accounting Policies [Line Items]                              
Interest rate caps - derivative     1,400,000         $ 4,800,000 $ 1,400,000            
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   0              
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 (7,800,000)            
Cynosure [Member]                              
Significant Accounting Policies [Line Items]                              
Intangible assets 994,000,000                            
Accelerated depreciation of acquired software               3,000,000              
Short and long-term marketable securities assumed                           $ 82,900,000  
Goodwill                           $ 683,500,000  
Medicor Medical Supply                              
Significant Accounting Policies [Line Items]                              
Intangible assets                       $ 5,400,000 $ 5,400,000    
Goodwill                         $ 8,900,000    
Gen-Probe Incorporated [Member] | Developed Technology Rights [Member]                              
Significant Accounting Policies [Line Items]                              
Intangible assets                       $ 3,700,000      
Scenario, Forecast [Member] | Cynosure [Member]                              
Significant Accounting Policies [Line Items]                              
Accelerated depreciation of acquired software             $ 5,900,000                
Discontinued Operations, Disposed of by Sale [Member] | Blood Screening Business | Developed Technology Rights [Member]                              
Significant Accounting Policies [Line Items]                              
Disposal Group, Including Discontinued Operation, Intangible Assets 154,000,000                            
Discontinued Operations, Disposed of by Sale [Member] | Blood Screening Business | Customer relationships                              
Significant Accounting Policies [Line Items]                              
Disposal Group, Including Discontinued Operation, Intangible Assets $ 387,700,000                            
Medical Aesthetics [Member]                              
Significant Accounting Policies [Line Items]                              
Goodwill     $ 0         683,500,000 0   $ 683,500,000        
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount                     2.00%        
Operating Segments [Member]                              
Significant Accounting Policies [Line Items]                              
Goodwill               $ 2,490,000,000              
Accounting Standards Update 2016-09 [Member]                              
Significant Accounting Policies [Line Items]                              
Increase to cash flows provided by operations                 11,000,000 $ 10,700,000          
Increase to cash flows used in financing activities                 $ 11,000,000 $ 10,700,000          
Forward foreign currency contracts                              
Significant Accounting Policies [Line Items]                              
Derivative contract period, or less               1 year