Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012 Stock Options [Member]	Oct. 01, 2011 Stock Options [Member]	Sep. 29, 2012 Stock Options [Member]	Oct. 01, 2011 Stock Options [Member]	Sep. 29, 2012 Non Vested Stock [Member]	Oct. 01, 2011 Non Vested Stock [Member]	Sep. 29, 2012 Non Vested Stock [Member]	Oct. 01, 2011 Non Vested Stock [Member]	Jan. 27, 2011 Common Stock [Member]
Minimum Weeks In Fiscal Year			P52W
Maximum Weeks In Fiscal Year			P53W
Number Of Weeks in Quarter	P13W	P13W
Public Offering [Abstract]
Public offering, shares of common stock													24,193,548
Basic:
Net income	$ 37,172	$ 41,132	$ 101,968	$ 139,921
Shares	117,678,000	117,050,000	117,531,000	114,214,000
Per Share	$ 0.32	$ 0.35	$ 0.87	$ 1.23
Effect of dilutive securities: [Abstract]
Add: Option shares in the money and dilutive effect of non-vested stock	792,000	956,000	844,000	975,000
Less: Pro forma treasury shares	(296,000)	(351,000)	(326,000)	(371,000)
Diluted:
Net Income	$ 37,172	$ 41,132	$ 101,968	$ 139,921
Shares	118,174,000	117,655,000	118,049,000	114,818,000
Per Share	$ 0.31	$ 0.35	$ 0.86	$ 1.22
Antidilutive Securities [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)					207,890	76,157	211,890	58,977	100,615	312,092	111,675	337,176
Number Of Weeks Year To Date			P39W	P39W