Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Minimum Weeks In Fiscal Year	P52W
Maximum Weeks In Fiscal Year	P53W
Number Of Weeks in Quarter	P13W	P13W
Basic:
Net income	$ 32,405	$ 28,571
Shares	117,915,000	117,302,000
Per Share	$ 0.27	$ 0.24
Effect of dilutive securities: [Abstract]
Add: Option shares in the money and dilutive effect of non-vested stock	690,000	875,000
Less: Pro forma treasury shares	(312,000)	(347,000)
Diluted:
Net Income	$ 32,405	$ 28,571
Shares	118,293,000	117,830,000
Per Share	$ 0.27	$ 0.24
Stock Options [Member]
Antidilutive Securities [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	191,628	211,890
Non Vested Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	64,180	123,260