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Borrowings (Credit Facility) (Details) - USD ($)
12 Months Ended
Dec. 29, 2015
Nov. 24, 2015
Nov. 23, 2015
Jun. 04, 2015
Jun. 03, 2015
Line of Credit Facility [Line Items]          
Maximum borrowing capacity       $ 75,000,000 $ 45,000,000
Amount outstanding $ 68,200,000.0        
Letters of credit outstanding 2,800,000        
Remaining borrowing capacity $ 29,000,000        
Revolving Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity   $ 100,000,000.0 $ 75,000,000.0 $ 10,000,000  
Minimum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee on unused portion of facility 12.50%        
Credit facility interest range 3.50%        
Maximum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee on unused portion of facility 0.30%        
Credit facility interest range 4.25%        
Secondary Rates [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.00%        
Secondary Rates [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.00%        
London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.00%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 100.00%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 2.00%        
Federal Funds Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.50%