Other Current Liabilities - Components of Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 28, 2018
Other Current Liabilities Details [Abstract]
Accrued self-insurance retentions	$ 8,337	$ 7,870
Accrued warranty and service liabilities	12,222	11,056
Accrued trade promotions	7,954	11,449
Payable for employee stock purchases	10,123	11,916
Customer advances and deferred revenue	46,693	39,995
Income taxes payable	8,939	8,515
Right of return refund liability	13,293	12,705
Operating lease liability, current	7,906	0
Other	35,978	39,535
Total	$ 151,445	$ 143,041