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Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Oct. 14, 2021
USD ($)
Sep. 25, 2021
USD ($)
Customer
Dec. 26, 2020
USD ($)
Dec. 28, 2019
USD ($)
Sep. 28, 2019
Mar. 30, 2019
USD ($)
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Sep. 25, 2021
USD ($)
Customer
Sep. 26, 2020
USD ($)
Customer
Sep. 28, 2019
USD ($)
Aug. 23, 2020
USD ($)
Significant Accounting Policies [Line Items]                        
Impairment charge   $ 1,800,000 $ 30,200,000 $ 30,200,000   $ 685,400,000            
Cash Equivalents Maturity Period                 three months or less      
Gross Carrying Value   5,582,100,000             $ 5,582,100,000 $ 4,931,100,000    
Accumulated Amortization   3,922,900,000             3,922,900,000 3,623,600,000    
Goodwill   3,281,600,000             3,281,600,000 2,657,900,000    
Purchase of interest rate caps             $ 1,500,000 $ 3,700,000 0 0 $ 1,500,000  
Principal amount of borrowings   1,000,000,000             1,000,000,000      
Notional Amount   861,500,000             $ 861,500,000      
Product Warranty Term                 1 year      
Advertising cost                 $ 9,800,000 15,600,000 29,500,000  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 500,000 $ 2,300,000    
Goodwill and Intangible Asset Impairment                     685,400,000  
Notional amount   $ 1,000,000,000             $ 1,000,000,000      
Customer Concentration Risk                        
Significant Accounting Policies [Line Items]                        
Number of customers with balance greater than specified percentage | Customer   0             0 1    
Trade names                        
Significant Accounting Policies [Line Items]                        
Gross Carrying Value   $ 268,100,000             $ 268,100,000 $ 245,500,000    
Accumulated Amortization   191,800,000             191,800,000 181,200,000    
Developed technology                        
Significant Accounting Policies [Line Items]                        
Gross Carrying Value   4,597,700,000             4,597,700,000 4,054,000,000    
Accumulated Amortization   3,184,200,000             3,184,200,000 2,907,200,000    
In-process research and development                        
Significant Accounting Policies [Line Items]                        
Gross Carrying Value   71,600,000             71,600,000 0    
Accumulated Amortization   0             $ 0 $ 0    
Accounts receivable [Member] | Customer Concentration Risk | One Customer                        
Significant Accounting Policies [Line Items]                        
Concentration risk, percentage                   11.90%    
Minimum                        
Significant Accounting Policies [Line Items]                        
Intangible assets useful life                 2 years      
Minimum | Accounts receivable [Member] | Customer Concentration Risk                        
Significant Accounting Policies [Line Items]                        
Concentration risk, percentage                 10.00% 10.00%    
Minimum | Total revenues [Member] | Customer Concentration Risk                        
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      
Interest rate caps - derivative                        
Significant Accounting Policies [Line Items]                        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 $ 500,000 $ 2,300,000    
Interest Rate Swap [Member]                        
Significant Accounting Policies [Line Items]                        
Interest rate caps - derivative   $ 18,700,000             18,700,000      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                 0 0    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax                 $ 9,400,000 (27,600,000) 3,500,000  
Acessa Health                        
Significant Accounting Policies [Line Items]                        
Goodwill                       $ 49,100,000
Acessa Health | Trade names                        
Significant Accounting Policies [Line Items]                        
Identifiable intangible assets:                   1,200,000    
Bolder Surgical | Subsequent Event                        
Significant Accounting Policies [Line Items]                        
Payments to Acquire Businesses, Gross $ 160,000,000                      
Medical Aesthetics                        
Significant Accounting Policies [Line Items]                        
Impairment charge       $ 30,200,000                
Medical Aesthetics | Distribution agreement [Member]                        
Significant Accounting Policies [Line Items]                        
Impairment charge                     27,700,000  
Medical Aesthetics | Customer Relationships                        
Significant Accounting Policies [Line Items]                        
Impairment charge                     22,400,000  
Medical Aesthetics | Trade names                        
Significant Accounting Policies [Line Items]                        
Impairment charge                     48,600,000  
Medical Aesthetics | Developed Technology                        
Significant Accounting Policies [Line Items]                        
Impairment charge                     576,900,000  
Medical Aesthetics | Property, Plant and Equipment [Member]                        
Significant Accounting Policies [Line Items]                        
Impairment charge                     9,800,000  
Forward foreign currency contracts                        
Significant Accounting Policies [Line Items]                        
Derivative contract period, or less                 1 year      
Interest rate caps - derivative                        
Significant Accounting Policies [Line Items]                        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax                 $ 500,000 2,300,000 3,100,000  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax                 $ 400,000 $ (500,000) $ (8,000,000.0)