Long-Term Debt (Narrative) (Details)	12 Months Ended
	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)	Dec. 28, 2013 USD ($)	Dec. 29, 2012 USD ($)
Line of Credit Facility [Line Items]
Ratio of Debt to Earnings Before Interest, Taxes, Depreciation And Amortization	2.08
Interest Coverage Ratio	8.14
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,107,587,000	$ 1,086,708,000	$ 917,900,000	$ 872,175,000
Interest Expense	11,100,000	$ 13,400,000	$ 14,700,000
Debt Issuance Cost	1,900,000
Write off of Deferred Debt Issuance Cost	$ 800,000
Weighted average interest rate	3.14%	2.34%	2.72%
Repayments of Lines of Credit	$ 50,000,000	$ 321,000,000	$ 165,100,000
Proceeds from Lines of Credit	0	286,000,000	$ 149,000,000
Unsecured U.S. Dollar-denominated revolving credit facility due May 2019 [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowings, maximum	375,000,000
Available unused credit facilities	375,000,000	325,000,000
Option to increase available credit	200,000,000
Unsecured Debt	$ 0	$ 50,000,000
Debt Instrument, Maturity Date	May 30, 2019
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	0.795%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum	1.45%
Debt Instrument, Basis Spread on Variable Rate	1.10%
Private Placement Senior Notes [Member]
Line of Credit Facility [Line Items]
Senior Notes	$ 100,000,000
Debt Instrument, Maturity Date	Jun. 01, 2017
Unsecured Five Year US Term Loan Due May Thirty Two Thousand Nineteen [Member]
Line of Credit Facility [Line Items]
Unsecured Debt	$ 150,000,000
Line of Credit Facility, Term	5 years
Debt Instrument, Periodic Payment, Principal	$ 1,900,000
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	0.875%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum	1.70%
Debt Instrument, Basis Spread on Variable Rate	1.25%
Unsecured Ten Year US Term Loan Due May Thirty Two Thousand Twenty Four [Member]
Line of Credit Facility [Line Items]
Unsecured Debt	$ 150,000,000
Line of Credit Facility, Term	10 years
Debt Instrument, Periodic Payment, Principal	$ 7,500,000
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	1.25%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum	2.075%
Debt Instrument, Basis Spread on Variable Rate	1.625%
Minimum
Line of Credit Facility [Line Items]
Ratio of Debt to Earnings Before Interest, Taxes, Depreciation And Amortization	3.50
Interest Coverage Ratio	2.50
Maximum
Line of Credit Facility [Line Items]
Ratio of Debt to Earnings Before Interest, Taxes, Depreciation And Amortization	3.75
Credit Agreement [Member] | Unsecured U.S. Dollar-denominated revolving credit facility due May 2019 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.15%
Credit Agreement [Member] | Minimum
Line of Credit Facility [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 200,000,000
Credit Agreement [Member] | Minimum | Unsecured U.S. Dollar-denominated revolving credit facility due May 2019 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.08%
Credit Agreement [Member] | Maximum | Unsecured U.S. Dollar-denominated revolving credit facility due May 2019 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.25%