Schedule for Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Income Tax Disclosure [Line Items]
Gross unrecognized tax benefits – beginning of the year	$ 3,014	$ 3,519
Gross increases related to current year tax positions	349	468
Gross increases related to prior year tax positions	232	469
Gross decreases related to prior year tax positions		(295)
Settlements		(356)
Lapse of statute of limitations	(1,010)	(791)
Gross unrecognized tax benefits – end of the year	$ 2,585	$ 3,014