Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2011	Jun. 29, 2010	Jun. 28, 2011	Jun. 29, 2010	Apr. 30, 2011
Stock-Based Compensation
Stock-based compensation expense	$ 2,965,000	$ 2,939,000	$ 5,946,000	$ 6,582,000
Income tax benefit	1,134,000	1,115,000	2,274,000	2,497,000
Capitalized stock-based compensation	57,000	78,000	130,000	132,000
Shares awarded under share-based compensation plan (in shares)					4,800,000
Shares awarded under share-based compensation plan prior to amendment (in shares)					3,800,000
Restricted shares
Outstanding at the end of the period (in shares)	700,000	600,000	700,000	600,000
Stock options
Stock-Based Compensation
Weighted average fair value at the grant date for options issued (in dollars per share)	$ 12.11	$ 11.14
Weighted average assumptions under Black-Scholes valuation model
Expected stock price volatility (as a percent)	39.00%	40.00%
Risk free interest rate (as a percent)	2.00%	2.50%
Expected option term (in years)	6.0	5.8
Stock option activity, shares
Outstanding, at the beginning of the period (in shares)			9,159,000
Granted (in shares)			660,000
Exercised (in shares)			(365,000)
Cancelled (in shares)			(211,000)
Outstanding at the end of the period (in shares)	9,243,000		9,243,000
Exercisable at the end of the period (in shares)	4,527,000		4,527,000
Weighted Average Exercise price
Outstanding at the beginning of the period (in dollars per share)			$ 22.63
Granted (in dollars per share)	$ 30.81		$ 30.81
Exercised (in dollars per share)	$ 20.44		$ 20.44
Cancelled (in dollars per share)	$ 19.73		$ 19.73
Outstanding at the end of the period (in dollars per share)	$ 23.35		$ 23.35
Exercisable at the end of the period (in dollars per share)	$ 27.01		$ 27.01
Weighted Average Remaining Contractual Term
Outstanding at the beginning of the period (in years)			5.4
Outstanding at the end of the period (in years)	5.1		5.1
Exercisable at the end of the period (in years)			3.8
Aggregate Intrinsic Value
Outstanding at the beginning of the period			79,835,000
Outstanding at the end of the period	80,979,000		80,979,000
Exercisable at the end of the period	24,592,000		24,592,000
Total intrinsic value of options exercised	2,300,000	1,800,000	3,700,000	3,900,000
Total unrecognized stock-based compensation expense	18,600,000		18,600,000
Expected weighted average period for recognition of compensation expense (in years)			2.6
Restricted shares
Aggregate Intrinsic Value
Total unrecognized stock-based compensation expense	7,900,000		7,900,000
Expected weighted average period for recognition of compensation expense (in years)			3.3
Restricted shares
Outstanding at the beginning of the period (in shares)			537,000
Granted (in shares)			192,000
Vested (in shares)			(36,000)
Forfeited (in shares)			(16,000)
Outstanding at the end of the period (in shares)	677,000		677,000
Fair value of shares vested	$ 800,000	$ 300,000	$ 900,000	$ 3,700,000
Weighted Average Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 14.72
Granted (in dollars per share)	$ 29.86	$ 22.94	$ 30.96
Vested (in dollars per share)			$ 26.03
Forfeited (in dollars per share)	$ 13.58		$ 13.58
Outstanding at the end of the period (in dollars per share)	$ 18.73		$ 18.73