Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 691,835
Other comprehensive income (loss)	(3,404)	$ 213	$ 3,663
Ending Balance	862,010	691,835
Unrealized Holding (Losses) Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,808	1,120	(930)
Other comprehensive income (loss)	(2,695)	1,688	2,050
Ending Balance	113	2,808	1,120
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4,807)	(3,332)	(4,945)
Other comprehensive income (loss)	(709)	(1,475)	1,613
Ending Balance	(5,516)	(4,807)	(3,332)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,999)	(2,212)	(5,875)
Other comprehensive income (loss)	(3,404)	213	3,663
Ending Balance	$ (5,403)	$ (1,999)	$ (2,212)