Periodic Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 09, 2012	Jun. 17, 2012	Mar. 25, 2012	Sep. 11, 2011	Jun. 19, 2011	Mar. 27, 2011	Dec. 30, 2012	Jan. 01, 2012	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Total revenues	$ 378,077	$ 376,124	$ 384,587	$ 376,326	$ 384,933	$ 389,186	$ 539,651	$ 501,748	$ 1,678,439	$ 1,652,193	$ 1,570,894
Operating margin	111,407	114,607	114,649	103,359	110,694	111,606	160,675	144,857	501,338	470,516	438,589
INCOME BEFORE PROVISION FOR INCOME TAXES	40,969	45,113	34,799	34,930	41,076	43,735	60,306	48,065	181,187	167,806	138,945
NET INCOME	$ 25,976	$ 28,095	$ 20,742	$ 22,091	$ 25,248	$ 27,111	$ 37,579	$ 30,911	$ 112,392	$ 105,361	$ 87,917
Earnings per common share - basic	$ 0.46	$ 0.50	$ 0.36	$ 0.37	$ 0.42	$ 0.46	$ 0.67	$ 0.54	$ 1.99	$ 1.79	$ 1.50
Earnings per common share - diluted	$ 0.44	$ 0.47	$ 0.35	$ 0.36	$ 0.40	$ 0.43	$ 0.64	$ 0.52	$ 1.91	$ 1.71	$ 1.45
Common stock dividends declared per share			$ 3.00						$ 3.00