Revolving Line of Credit - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Debt Instrument [Line Items]
Commitment fee	0.15%
Credit facility, borrowing outstanding	$ 0	$ 0
EBITDA to interest expense ratio	795.00
EBITDA to interest expense, minimum allowable ratio	2.00
Total funded debt to EBITDA ratio	0.0
Total funded debt to EBITDA, maximum allowable ratio	2.50
Proceeds from Line of Credit	$ 100,000,000	97,000,000
Repayment of Line of Credit	100,000,000	$ 97,000,000
Payments of interest expenses on borrowings	200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit, current borrowing capacity	$ 150,000,000.0
Basis spread on variable rate	0.45%
Line of credit, expiration date	Mar. 31, 2023
Revolving Credit Facility | Alternative Prime Rate
Debt Instrument [Line Items]
Debt interest rate at end of period	3.25%
Revolving Credit Facility | LIBOR rate
Debt Instrument [Line Items]
Debt interest rate at end of period	0.15%