Quarterly Financial Information (parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	12 Months Ended
	Oct. 07, 2017	Jul. 15, 2017	Apr. 22, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Schedule Of Quarterly Financial Information [Line Items]
Understatement of cash flows from operating activities				$ 295,893	$ 297,389	$ 356,562
Understatement of cash flows used in investing activities				$ (301,805)	$ (35,395)	(76,714)
Revisions
Schedule Of Quarterly Financial Information [Line Items]
Understatement of cash flows from operating activities	$ (12,800)	$ (12,100)	$ (5,900)			6,667
Understatement of cash flows used in investing activities	$ (12,800)	$ (12,100)	$ (5,900)			$ (6,667)