Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 31, 2017	Dec. 30, 2017
Accounting Policies [Abstract]
Accrued payroll and related expenses	$ 74,952		$ 67,935
Accrued warranty	59,451		52,834
Contract liabilities	57,913	$ 47,647	31,069
Accrued customer rebates	45,740		48,590
Accrued sales and other tax	19,452		20,881
Accrued professional fees	17,313		18,250
Accrued product liability and workers compensation	16,284		11,976
Accrued agent commission	11,969		11,035
Other accrued expenses	64,372		59,601
Accrued expenses	$ 367,446		$ 322,171