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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 27, 2019
Sep. 28, 2018
Finite-Lived Intangible Assets [Line Items]    
Total $ 428,952 $ 773,307
Less accumulated amortization (247,724) (260,522)
Intangible assets — net 181,228 512,785
Trade name, indefinite lived    
Finite-Lived Intangible Assets [Line Items]    
Total 3,400 3,400
Acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Total 179,682 251,673
Less accumulated amortization (134,800) (140,000)
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Total 245,870 518,234
Less accumulated amortization $ (112,900) $ (120,500)