Stock Plans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013 plan	Jul. 01, 2012	Jun. 30, 2013 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Stock Awards [Member]	Jul. 01, 2012 Stock Awards [Member]	Apr. 01, 2012 Stock Awards [Member]	Jun. 30, 2013 Stock Awards [Member]	Jul. 01, 2012 Stock Awards [Member]	Jun. 30, 2013 Performance Units [Member]	Jul. 01, 2012 Performance Units [Member]	Jun. 30, 2013 Performance Units [Member]	Jul. 01, 2012 Performance Units [Member]	Jun. 30, 2013 Restricted Stock Awards [Member]	Jul. 01, 2012 Restricted Stock Awards [Member]	Jun. 30, 2013 Restricted Stock Awards [Member]	Jul. 01, 2012 Restricted Stock Awards [Member]	Dec. 30, 2012 Restricted Stock Awards [Member]	Jun. 30, 2013 Stock Options [Member]	Jul. 01, 2012 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jul. 01, 2012 Stock Options [Member]	Jun. 30, 2013 2009 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Former Stock-based Compensation Plans			1
Shares authorized under plan					5,000,000																			10,000,000
Total income tax benefit recognized for stock-based compensation	$ 1,000,000	$ 1,500,000	$ 2,400,000	$ 3,400,000
Stock-based compensation costs capitalized as part of inventory			300,000	300,000
Options related excess tax benefit, classified as a financing cash activity			0	1,139,000
Weighted-average grant-date fair value of options																				$ 9.82	$ 7.73	$ 10.82	$ 7.35
Total intrinsic value of options exercised																				1,000,000	900,000	4,100,000	5,200,000
Cash received from option exercises																						7,300,000	11,700,000
Shares/units granted					89,521	3,263	3,580	955					98,056	122,675			272,000
Weighted-average grant-date fair value of stock granted (per share)					$ 30.51				$ 30.65	$ 27.87			$ 34.06	$ 26.18	$ 32.34	$ 25.55	$ 33.70	$ 25.83
Fair value of restricted stock awards vested															300,000	1,300,000	7,200,000	4,200,000
Total pre-tax stock-based compensation expense	3,226,000	4,776,000	7,642,000	10,252,000		700,000	700,000		700,000	700,000	0	600,000	900,000	2,800,000	1,700,000	2,200,000	3,900,000	4,100,000		800,000	1,300,000	2,100,000	2,500,000
Awards/units outstanding											282,044		282,044		693,000		693,000		781,000
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent											4,500,000		4,500,000
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted															$ 12,900,000		$ 12,900,000			$ 8,000,000		$ 8,000,000
Weighted-average period for recognition of unrecognized compensation cost, years																	1 year 7 months					2 years 1 month
Shares available for grant under employee stock purchase plan					1,100,000