Long-Term Debt (Details Textual) (USD $)	12 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011	Feb. 25, 2011	Sep. 15, 2010	Dec. 30, 2012 Letter of Credit [Member]	Dec. 30, 2012 4.04% Senior Notes due September 2015 [Member]	Jan. 01, 2012 4.04% Senior Notes due September 2015 [Member]	Dec. 30, 2012 4.74% Senior Notes due September 2017 [Member]	Jan. 01, 2012 4.74% Senior Notes due September 2017 [Member]	Dec. 30, 2012 5.30% Senior Notes due September 2020 [Member]	Jan. 01, 2012 5.30% Senior Notes due September 2020 [Member]	Dec. 30, 2012 Term Loans Due October 2015, weighted average rate of 1.59% [Member]	Oct. 22, 2012 Term Loans Due October 2015, weighted average rate of 1.59% [Member]	Jan. 01, 2012 Term Loans Due October 2015, weighted average rate of 1.59% [Member]	Dec. 30, 2012 $550.0 million revolving credit facility [Member]	Jan. 01, 2012 $550.0 million revolving credit facility [Member]
Line of Credit Facility [Line Items]
Long-term debt	$ 543,300,000	$ 298,000,000	$ 250,000,000				$ 75,000,000	$ 75,000,000	$ 100,000,000	$ 100,000,000	$ 75,000,000	$ 75,000,000	$ 200,000,000		$ 0	$ 79,000,000	$ 48,000,000
Maximum capacity under credit facility					590,000,000
Debt issued, amount														200,000,000
Refinanced existing credit facility				590,000,000
Stated interest rate							4.04%		4.74%		5.30%		1.59%
Weighted Average rate under credit facility																2.82%	2.48%
Uncommitted credit line facility amount outstanding	0	0
Uncommitted credit line permits extensions for standby letters of credit	5,000,000
Incremental line of credit for standby letters of credit	2,000,000
Letter of credit, outstanding						13,600,000
Credit agreement provides for facility fees Minimum	0.20%
Credit agreement provides for facility fees Maximum	0.45%
Total capital leases	14,300,000
Capital leases, current	1,500,000
Amount for lender commitments				550,000,000
Available borrowings capacity under letters of credit	458,600,000
Available capacity under credit facility	550,000,000
No payments due until it matures excluding interest and fees	550,000,000
Total interest expense including credit facility fees and other bank charges	$ 18,200,000	$ 16,700,000	$ 6,900,000