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Commitments and Contingencies (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Activity related to the warranty accrual      
Balance at beginning of period $ 11,964 $ 11,264 $ 8,464
Liability assumed 0 0 2,186
Provision 14,091 10,798 8,591
Warranty usage (12,199) (10,098) (7,977)
Balance at end of period $ 13,856 $ 11,964 $ 11,264