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Income Taxes - Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of fiscal year $ 184 $ 184 $ 184
Additions for tax positions in prior years 6,663 0 0
Reductions due to lapse of applicable statute of limitations (1,004) 0 0
Balance at end of fiscal year $ 5,843 $ 184 $ 184