Stock Plans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012 years	Jul. 03, 2011	Jan. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Former Stock-based Compensation Plans			1
Total income tax benefit recognized for stock-based compensation	$ 1,500,000	$ 1,700,000	$ 3,400,000	$ 2,700,000
Stock-based compensation costs capitalized as part of inventory			300,000	200,000
Options related excess tax benefit, classified as a financing cash activity			1,139,000	8,591,000
Total pre-tax stock-based compensation expense	4,776,000	4,906,000	10,252,000	7,960,000
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent	6,300,000		6,300,000
2009 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan	10,000,000		10,000,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan	5,000,000		5,000,000
Shares/units granted			53,961
Weighted-average grant-date fair value of stock granted (per share)			$ 24.51
Shares available for grant under employee stock purchase plan	1,200,000		1,200,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options	$ 7.73	$ 8.29	$ 7.35	$ 7.86
Total intrinsic value of options exercised	900,000	1,800,000	5,200,000	6,900,000
Cash received from option exercises			11,700,000	23,600,000
Total pre-tax stock-based compensation expense	1,300,000	1,100,000	2,500,000	2,200,000
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	8,800,000		8,800,000
Weighted-average period for recognition of unrecognized compensation cost, years			2.2
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units granted			351,000
Weighted-average grant-date fair value of stock granted (per share)	$ 25.55	$ 27.81	$ 25.83	$ 26.77
Fair value of restricted stock awards vested	1,300,000	2,400,000	4,200,000	5,300,000
Total pre-tax stock-based compensation expense	2,200,000	1,600,000	4,100,000	3,000,000
Awards/units outstanding	825,000		825,000		672,000
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	13,800,000		13,800,000
Weighted-average period for recognition of unrecognized compensation cost, years			1.7
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units granted			122,675	89,828
Weighted-average grant-date fair value of stock granted (per share)			$ 26.18	$ 26.71
Total pre-tax stock-based compensation expense	600,000	1,400,000	2,800,000	1,900,000
Awards/units outstanding	322,516		322,516
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units granted	4,535	3,544
Weighted-average grant-date fair value of stock granted (per share)			$ 27.87	$ 28.22
Total pre-tax stock-based compensation expense			$ 700,000	$ 800,000