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Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 08, 2013	Jun. 16, 2013	Mar. 24, 2013	Sep. 09, 2012	Jun. 17, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Earnings Per Share [Abstract]
Net income available to common stockholders - basic and diluted	$ 30,632	$ 33,270	$ 34,420	$ 25,976	$ 28,095	$ 20,742	$ 44,663	$ 37,579	$ 142,985	$ 112,392	$ 105,361
Weighted average number of common shares									55,345,554	56,419,645	58,918,038
Earnings per common share - basic	$ 0.56	$ 0.60	$ 0.62	$ 0.46	$ 0.50	$ 0.36	$ 0.81	$ 0.67	$ 2.58	$ 1.99	$ 1.79
Diluted weighted average number of common shares									57,720,998	58,997,476	61,653,519
Earnings per common share - diluted	$ 0.53	$ 0.57	$ 0.59	$ 0.44	$ 0.47	$ 0.35	$ 0.78	$ 0.64	$ 2.48	$ 1.91	$ 1.71

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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