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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Mar. 27, 2020
Mar. 31, 2019
Income Tax [Line Items]          
Income tax expense (benefit) $ (6,536,000) $ 14,190,000 $ (2,195,000)    
Net operating loss carryforwards 14,364,000 3,721,000      
Deferred tax assets, valuation allowance 30,381,000 16,116,000     $ 13,600,000
Unrecognized tax benefits, income tax penalties and interest accrued 0 0      
Uncertain tax positions 0 0      
Valuation Allowance Tax Credit Carryforward [Member]          
Income Tax [Line Items]          
Deferred tax assets, valuation allowance 30,400,000 16,100,000      
Federal and State Income Tax [Member]          
Income Tax [Line Items]          
Net operating loss carryforwards 14,300,000 $ 3,700,000      
COVID 19 [Member]          
Income Tax [Line Items]          
Tax refund from net operating loss carryback       $ 6,700,000  
Income tax expense (benefit) $ 6,700,000