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Fair Value - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Modified former loans receivable $ 44.0 $ 44.0
Equity investments in privately-held companies 64.2 37.2
Notes Receivable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long term $ 33.6 29.7
Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Minimum remaining maturity of foreign currency derivatives (in months) 1 month  
Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Minimum remaining maturity of foreign currency derivatives (in months) 15 months  
C P T C | Term Loan    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Modified former loans receivable $ 44.0 $ 44.0