Annual report pursuant to Section 13 and 15(d)

Stockholders Equity - ATM offering (Details)

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Stockholders Equity - ATM offering (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Equity [Abstract]      
Sales of common stock from ATM offering, net of fees and expenses (in shares) 3,041,256    
Net Proceeds from Sale of Common Stock $ 48,167 $ 0 $ 0
Repayments of Long-term Lines of Credit $ (25,000) $ (5,000) $ 0