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(9) Performance Shares, Stock Options, Other Forms of Compensation, and Common Share Repurchases (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2015
Mar. 29, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 28, 2014
Dec. 29, 2013
Common Share Repurchases [Line Items]              
Number Of Shares Authorized To Be Repurchased 1,000,000     1,000,000      
Average Cost Per Repurchased Share $ 30.67     $ 28.92      
Number Of Shares Repurchased 118,210     195,899      
Payments for Repurchase of Equity $ 3.6     $ 5,700,000      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Number of Shares Available for Grant 350,000     350,000      
Allocated Share-based Compensation Expense $ 84,000   $ 71,000 $ 256,000 $ 189,000    
Average Price of Shares Forfeited $ 31.25     $ 31.25      
Board of Directors' Compensation [Abstract]              
Board of Director Cash Compensation $ 77,000   118,000 $ 153,000 230,000    
Total Board of Directors Compensation $ 154,000   $ 161,000 $ 313,000 283,000    
Options Outstanding Rollforward [Abstract]              
Outstanding options (in shares) 211,000 291,000   211,000   196,000  
Outstanding Weighted Average Exercise Price $ 28.15 $ 28.66   $ 28.15   $ 27.67  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   95,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 30.66          
Options canceled or expired (in shares) (5,000)            
Canceled or Expired Weighted Average Exercise Price $ 10.98            
Share-based Compensation Arrangement By Share-based Payment Award Options Outstanding Weighted Average Remaining Contractual Term 6 years 6 months 2190 days   7 years 4 months 24 days       6 years 6 months 2190 days
Shares Issued Net of Option Forfeitures (75,000)     (75,000)      
Weighted average fair value of options $ 7.55         $ 10.42  
Expected life (in years) 3 years 10 months 1119 days         4 years 9 months 1478 days  
Expected stock volatility 37.40%         41.90%  
Risk-free interest rate 1.00%         1.40%  
CEO Employment [Member]              
Board of Directors' Compensation [Abstract]              
Option Vesting Installment 12,500            
CFO Employment [Member]              
Options Outstanding Rollforward [Abstract]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     78,000        
Two Thousand Ten Repurchase Plan [Member]              
Common Share Repurchases [Line Items]              
Average Cost Per Repurchased Share $ 17.93            
Number Of Shares Repurchased 922,311            
Payments for Repurchase of Equity $ 16,500,000            
Two Thousand Twelve Repurchase Plan [Member]              
Common Share Repurchases [Line Items]              
Number Of Shares Authorized To Be Repurchased 1,000,000     1,000,000      
Average Cost Per Repurchased Share       $ 18.57      
Number Of Shares Repurchased       1,000,000      
Payments for Repurchase of Equity       $ 18,600,000      
Two Thousand Eleven Program [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense $ 0   $ 0 0 (55,000)    
Stock Granted During Period, Value, Share-based Compensation, Forfeited         55,000    
Two Thousand Twelve Program [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense 0   (170,000) 0 (540,000)    
Stock Granted During Period, Value, Share-based Compensation, Forfeited     206,000   607,000    
Two Thousand Thirteen Program [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense $ 8,000   (108,000) $ 36,000 (374,000)    
Stock Granted During Period, Value, Share-based Compensation, Forfeited     28,000   77,000    
Maximum Payout Percentage 100.00%     100.00%      
Two Thousand Thirteen Program [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Stock Granted During Period, Value, Share-based Compensation, Forfeited     114,000   394,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 23,070            
Estimated Payout Of Shares Granted 21,408            
Two Thousand Thirteen Program [Member] | Performance Stock Units (PSUs) [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 2,230            
Estimated Payout Of Shares Granted 2,069            
Two Thousand Thirteen Program [Member] | Performance Shares and Performance Stock Units [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Assumed Achievement Percentage 100.00%     100.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 25,300            
Estimated Payout Of Shares Granted 22,477            
Estimated Attainment Percentage 92.80%     92.80%      
Performance Programs Total [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense $ 8,000   (278,000) $ 36,000 (969,000)    
Director Program [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense 0   15,000 0 17,000    
Stock Granted During Period, Value, Share-based Compensation, Forfeited         20,000    
Director Program [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense     15,000 30,000 17,000    
Director Program [Member] | Stock Option Member              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense 62,000   28,000 130,000 36,000    
Restricted Stock And Restricted Stock Units [Member]              
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense $ 15,000   $ 0 30,000 (73,000)    
Stock Granted During Period, Value, Share-based Compensation, Forfeited       $ 45,000 $ 128,000