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Definite-lived Intangibles (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 27, 2021
Dec. 28, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 445,150 $ 445,150
Accumulated Amortization (194,831) (163,843)
Net Carrying Amount 250,319 281,307
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 397,500 397,500
Accumulated Amortization (176,979) (150,142)
Net Carrying Amount $ 220,521 $ 247,358
Weighted Average Amortization Period 10 years 10 months 24 days 10 years 10 months 24 days
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 47,650 $ 47,650
Accumulated Amortization (17,852) (13,701)
Net Carrying Amount $ 29,798 $ 33,949
Weighted Average Amortization Period 9 years 6 months 9 years 6 months