Stock Plans (Summary of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Stock option activity
Shares outstanding at beginning of the year	3,494,000	4,266,000	5,346,000
Shares granted	520,000	518,000	756,000
Shares exercised	(1,024,000)	(947,000)	(1,611,000)
Shares canceled	(4,000)	(8,000)	(210,000)
Shares forfeited	(158,000)	(335,000)	(15,000)
Shares outstanding at end of year	2,828,000	3,494,000	4,266,000
Shares exercisable at end of year	1,900,000	2,392,000	2,677,000
Number of shares vested and expected to vest in the future	2,800,000
Weighted-average price, outstanding at beginning of year (per share)	$ 23.34	$ 21.64	$ 20.57
Weighted-average price, granted (per share)	$ 43.12	$ 33.62	$ 26.28
Weighted-average price, exercised (per share)	$ 23.89	$ 21.45	$ 20.16
Weighted-average price, canceled (per share)	$ 20.97	$ 22.88	$ 22.34
Weighted-average price, forfeited (per share)	$ 35.33	$ 23.04	$ 21.98
Weighted-average price, outstanding at end of year (per share)	$ 26.11	$ 23.34	$ 21.64
Weighted-average price, exercisable at end of year (per share)	$ 21.13	$ 20.66	$ 20.00