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Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 09, 2018	Jun. 17, 2018	Mar. 25, 2018	Sep. 10, 2017	Jun. 18, 2017	Mar. 26, 2017	Dec. 30, 2018	Dec. 31, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Earnings Per Share [Abstract]
Net income available to common stockholders - basic and diluted	$ 84,095	$ 77,408	$ 88,827	$ 56,368	$ 65,741	$ 62,469	$ 111,642	$ 93,327	$ 361,972	$ 277,905	$ 214,678
Weighted average number of common shares									41,856,017	45,954,659	48,647,167
Earnings per common share - basic	$ 2.02	$ 1.84	$ 2.07	$ 1.22	$ 1.37	$ 1.31	$ 2.71	$ 2.17	$ 8.65	$ 6.05	$ 4.41
Diluted weighted average number of common shares									43,331,278	47,677,834	49,923,859
Earnings per common share - diluted	$ 1.95	$ 1.78	$ 2.00	$ 1.18	$ 1.32	$ 1.26	$ 2.62	$ 2.09	$ 8.35	$ 5.83	$ 4.30

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