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Estimated Future Amortization Expense Related to Finite-Lived Purchased Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
2019 $ 615  
2020 274  
Finite Lived, Net Carrying Amount $ 889 $ 1,503