Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Line Items]
Federal, Current									$ 52,422	$ 60,650	$ 72,025
State, Current									10,367	9,410	8,312
Foreign, Current									504	993	500
Total current									63,293	71,053	80,837
Federal, Deferred									4,212	1,730	(17,110)
State, Deferred									555	385	79
Total deferred									4,767	2,115	(17,031)
Income taxes	$ 15,608	$ 16,619	$ 19,042	$ 16,791	$ 16,889	$ 19,304	$ 20,095	$ 16,880	$ 68,060	$ 73,168	$ 63,806