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Debt and Credit Facilities - Component of Long-term Debt (Detail) - USD ($)
$ in Thousands
Mar. 28, 2021
Dec. 27, 2020
Debt Instrument [Line Items]    
Long-term debt $ 11,953 $ 15,953
Less: current portion of long-term debt (833) (333)
Current portion of debt 833 333
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 2,786 6,286
Paycheck Protection Program Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 10,000 $ 10,000