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Debt (Details) (USD $)
3 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Jul. 30, 2013
Interest rate swap, August 2011
Jan. 01, 2013
Interest rate swap, August 2011
Aug. 30, 2011
Interest rate swap, August 2011
Jul. 30, 2013
Interest rate swap, July 2013
Mar. 30, 2014
Interest rate swap
Mar. 30, 2014
Interest rate swap
Interest expense
Sep. 30, 2010
Revolving line of credit
Mar. 30, 2014
Revolving line of credit
Dec. 29, 2013
Revolving line of credit
Apr. 30, 2013
Revolving line of credit
Apr. 30, 2013
Revolving line of credit
Minimum
Apr. 30, 2013
Revolving line of credit
Maximum
Apr. 30, 2013
Revolving line of credit
LIBOR
Minimum
Apr. 30, 2013
Revolving line of credit
LIBOR
Maximum
Debt                                
Revolving line of credit                   $ 177,200,000 $ 157,900,000          
Line of credit facility, maximum borrowing capacity                 175,000,000     300,000,000        
Line of credit facility, term                 5 years              
Interest margin rate on debt                             0.75% 1.75%
Percentage of commitment fee on unused credit facility                         0.15% 0.25%    
Line of credit facility, remaining availability                   102,100,000            
Interest rate swap agreement, fixed interest rate       0.56% 0.53% 1.42%                    
Interest rate swap agreement, notional amount       50,000,000 50,000,000 75,000,000                    
Termination of interest rate swap     50,000,000                          
Weighted average interest rate for credit facility borrowings, including the impact of interest rate swaps 1.50% 1.20%                            
Interest paid 717,000 378,000                            
Interest rate swap liabilities             129,000                  
Portion of derivative liability that would be reclassified into earnings               $ 32,000                
Estimate of period of time over which portion of derivative liability would be reclassified into earnings               12 months