LONG-TERM DEBT. (Details) (USD $) | 0 Months Ended | | | | | 6 Months Ended | | 0 Months Ended | | | | |
Dec. 19, 2012 | Jun. 28, 2014 | Jun. 28, 2014 | Dec. 28, 2013 | Apr. 29, 2013 | Dec. 19, 2012 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Jun. 28, 2014 | Aug. 09, 2013 | Jun. 28, 2013 | Jun. 28, 2014 | Apr. 29, 2013 | Dec. 19, 2012 | Jun. 28, 2014 |
Amended And Restated Credit Agreement [Member] | Amended And Restated Credit Agreement [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Letter Of Credit [Member] |
Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Interest Rate Swap [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | Wells Fargo [Member] | |
| item | | | | | Prime Rate [Member] | London Interbank Offered Rate L I B O R [Member] | Base Rate [Member] | Debt Instrument Variable Rate Federal Funds Rate [Member] | Minimum [Member] | Minimum [Member] | Minimum [Member] | Maximum [Member] | Maximum [Member] | Maximum [Member] | Cash Flow Hedging [Member] | | | | | |
| | | | | | | | | | | London Interbank Offered Rate L I B O R [Member] | Base Rate [Member] | | London Interbank Offered Rate L I B O R [Member] | Base Rate [Member] | | | | | | |
Long-term debt. | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Maximum borrowing capacity | $45,000,000 | ' | ' | ' | ' | $35,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $10,000,000 | ' |
Term of credit agreement | '5 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Unused credit capacity under the agreement | ' | ' | 31,300,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of financial covenants to be complied with | ' | 3 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Variable interest rate basis | ' | ' | ' | ' | ' | ' | 'prime rate | 'LIBOR | 'federal funds rate plus 0.50% | 'federal funds rate | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Basis spread on variable interest rate basis (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.50% | ' | 1.50% | 0.50% | ' | 2.50% | 1.50% | ' | ' | ' | ' | ' | ' |
Interest rate (as a percent) | ' | 2.48% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Quarterly commitment fee (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.20% | ' | ' | 0.50% | ' | ' | ' | ' | ' | ' | ' | ' |
Principal amount of debt | ' | ' | 0 | 0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 10,000,000 | ' | ' |
Amount of line of credit facility converted to term debt | ' | ' | ' | ' | 10,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Principal amount payable in quarterly installments | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 166,667 | ' | ' | ' | ' |
Outstanding amount | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 9,300,000 | ' | ' | ' |
Notional amount | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 5,000,000 | ' | ' | ' | ' | ' |
Fixed interest rate (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 3.10% | ' | ' | ' | ' | ' |
Aggregate outstanding amount | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $3,700,000 |