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Schedule of Income Taxes Calculated on Income from Continuing Operations Before Income Taxes and 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]
Income taxes at federal income tax rate									$ 68,960	$ 84,281	$ 76,810
State income taxes, net of federal income tax benefit									7,713	5,417	4,505
Non-deductible executive compensation									1,012
Meals and entertainment exclusion									719	1,021	958
Share-based payments									(2,138)	(1,549)	(239)
Section 199 deductions and R&D credits									(3,309)	(5,546)	(250)
Tax Reform Act										(19,530)
Other, net									211	(288)	323
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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