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Summary of Significant Accounting Policies (Allowance for doubtful accounts) (Details) - Allowance for doubtful accounts - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 3,559 $ 3,867 $ 1,904
Current period provision 3,625 508 2,440
Amounts written off (1,685) (1,099) (461)
Recoveries and other adjustments 15 283 (16)
Balance at end of period $ 5,514 $ 3,559 $ 3,867