Parent Company Condensed Statements Of Income (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
Schedule of Condensed Consolidating Statement of Operations [Line Items]
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
COMPREHENSIVE INCOME									112,407	105,700	89,283
EARNINGS PER SHARE:
Common Stock - basic	$ 0.46	$ 0.50	$ 0.36	$ 0.37	$ 0.42	$ 0.46	$ 0.67	$ 0.54	$ 1.99	$ 1.79	$ 1.50
Common Stock - diluted	$ 0.44	$ 0.47	$ 0.35	$ 0.36	$ 0.40	$ 0.43	$ 0.64	$ 0.52	$ 1.91	$ 1.71	$ 1.45
Parent Company
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Equity earnings in subsidiaries									112,392	105,361	87,917
INCOME BEFORE PROVISION FOR INCOME TAXES									112,392	105,361	87,917
NET INCOME									112,392	105,361	87,917
COMPREHENSIVE INCOME									$ 112,407	$ 105,700	$ 89,283
EARNINGS PER SHARE:
Common Stock - basic									$ 1.99	$ 1.79	$ 1.50
Common Stock - diluted									$ 1.91	$ 1.71	$ 1.45