Reconciliation of Provision for Income Taxes at Federal Statutory Tax Rate to Earnings Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Income Tax Disclosure [Abstract]
Federal tax at statutory income tax rate	$ 1,059,627	$ 1,029,132	$ 1,004,241
State income taxes (net of federal tax benefit)	50,621	47,451	31,553
ESOP dividend	(65,111)	(65,232)	(62,630)
Other, net	(85,330)	(96,663)	(68,951)
Remeasurement of deferred income taxes	(224,195)	0	0
Income tax expense	$ 735,612	$ 914,688	$ 904,213