Common Stock Plans (Stock Options) (Details) (Stock Incentive Plan, USD $)	0 Months Ended				12 Months Ended
	Jan. 26, 2011	Jan. 27, 2010	Aug. 24, 2009	Jan. 28, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Remaining reserved for issuance					3,798,701
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting period					3 years
Share-based compensation, expiration period					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning of Period, Shares					1,276,043	1,107,809	620,517
Outstanding, Beginning of Period, Weighted Average Exercise Price					$ 40.16	$ 36.83	$ 40.75
Granted, Shares	293,978	281,110	4,750	538,492	293,978	281,110	543,242
Granted, Weighted Average Exercise Price					$ 54.99	$ 46.69	$ 29.91
Exercised, Shares					(227,405)	(111,676)	(55,950)
Exercised, Weighted Average Exercise Price					$ 32.33	$ 23.83	$ 13.10
Forfeited, Shares					(4,375)	(1,200)
Forfeited, Weighted Average Exercise Price					$ 35.35	$ 13.72
Outstanding, End of Period, Shares					1,338,241	1,276,043	1,107,809
Outstanding, End of Period, Weighted Average Exercise Price					$ 44.77	$ 40.16	$ 36.83
Exercisable, Shares					677,753	574,992	360,229
Exercisable, Weighted Average Exercise Price					$ 43.72	$ 41.16	$ 36.87
Remaining reserved for issuance					3,798,701