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Share-Based Compensation Associates Stock Buying Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 33.00% 0.00% 0.00%
Share-based Compensation, Associate Stock Buying Plan, Fair Value Assumptions, Risk Free Interest Rate     0.10%
Share-based Compensation $ 2,779 $ 2,787 $ 3,109
Stock Issued During Period, Shares, Employee Stock Purchase Plans 81,111 69,980 75,119
Common Stock, Capital Shares Available For Future Issuance 959,702    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 4 years 0 days 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00%
Associates Stock Purchase Plan [Member]      
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]      
Share-based Compensation $ 200 $ 170 $ 201
Common Stock, Capital Shares Available For Future Issuance 195,890 277,001 346,981
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 months 6 months 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00%
Minimum [Member]      
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 27.00% 35.00% 30.00%
Share-based Compensation, Associate Stock Buying Plan, Fair Value Assumptions, Risk Free Interest Rate 0.40% 0.10%  
Maximum [Member]      
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 37.00% 36.00% 34.00%
Share-based Compensation, Associate Stock Buying Plan, Fair Value Assumptions, Risk Free Interest Rate 0.50% 0.30%