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Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Federal, Current									$ 60,650	$ 72,025	$ 68,548
State, Current									9,410	8,312	6,668
Foreign, Current									993	500	563
Total current									71,053	80,837	75,779
Federal, Deferred									1,730	(17,110)	6,104
State, Deferred									385	79	224
Total deferred									2,115	(17,031)	6,328
Income taxes	$ 16,889	$ 19,304	$ 20,095	$ 16,880	$ 4,759	$ 17,490	$ 22,689	$ 18,868	$ 73,168	$ 63,806	$ 82,107

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