LONG-TERM DEBT (Details) - USD ($) | Jun. 28, 2013 | Dec. 19, 2012 | Sep. 26, 2015 | Dec. 27, 2014 | Aug. 27, 2014 | Aug. 09, 2013 | Apr. 29, 2013 |
Credit Agreement | Wells Fargo | | | | | | | |
Long-term debt. | | | | | | | |
Maximum borrowing capacity | | $ 45,000,000 | | | | | |
Term of credit agreement | | 5 years | | | | | |
Unused credit capacity under the agreement | | | $ 35,000,000 | | | | |
Effective interest rate (as a percent) | | | 2.70% | 2.50% | | | |
Flat cash dividend limit of capital stock issued and outstanding (per share) | | | | | $ 0.03 | | |
Credit Agreement | Wells Fargo | Prime rate | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | prime rate | | | | |
Credit Agreement | Wells Fargo | LIBOR | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | LIBOR | | | | |
Revolving credit facility | Wells Fargo | | | | | | | |
Long-term debt. | | | | | | | |
Maximum borrowing capacity | | | $ 35,000,000 | | | | |
Borrowings outstanding under credit facility | | | $ 0 | $ 0 | | | |
Amount of line of credit facility converted to term debt | | | | | | | $ 10,000,000 |
Revolving credit facility | Wells Fargo | Prime rate | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | prime rate | | | | |
Revolving credit facility | Wells Fargo | LIBOR | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | LIBOR | | | | |
Revolving credit facility | Wells Fargo | Alternate base rate | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | federal funds rate plus 0.50% | | | | |
Revolving credit facility | Wells Fargo | Federal funds rate | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | federal funds rate | | | | |
Basis spread on variable interest rate basis (as a percent) | | | 0.50% | | | | |
Revolving credit facility | Wells Fargo | Minimum | | | | | | | |
Long-term debt. | | | | | | | |
Quarterly commitment fee (as a percent) | | | 0.20% | | | | |
Revolving credit facility | Wells Fargo | Minimum | LIBOR | | | | | | | |
Long-term debt. | | | | | | | |
Basis spread on variable interest rate basis (as a percent) | | | 1.50% | | | | |
Revolving credit facility | Wells Fargo | Minimum | Alternate base rate | | | | | | | |
Long-term debt. | | | | | | | |
Basis spread on variable interest rate basis (as a percent) | | | 0.50% | | | | |
Revolving credit facility | Wells Fargo | Maximum | | | | | | | |
Long-term debt. | | | | | | | |
Quarterly commitment fee (as a percent) | | | 0.50% | | | | |
Revolving credit facility | Wells Fargo | Maximum | LIBOR | | | | | | | |
Long-term debt. | | | | | | | |
Basis spread on variable interest rate basis (as a percent) | | | 2.50% | | | | |
Revolving credit facility | Wells Fargo | Maximum | Alternate base rate | | | | | | | |
Long-term debt. | | | | | | | |
Basis spread on variable interest rate basis (as a percent) | | | 1.50% | | | | |
Term Loan Facility | Interest rate swap | Cash flow | | | | | | | |
Long-term debt. | | | | | | | |
Notional amount | | | | | | $ 5,000,000 | |
Fixed interest rate (as a percent) | | | | | | 3.10% | |
Term Loan Facility | Wells Fargo | | | | | | | |
Long-term debt. | | | | | | | |
Maximum borrowing capacity | | | $ 10,000,000 | | | | |
Principal amount of debt | | | | | | | $ 10,000,000 |
Principal amount payable in quarterly installments | $ 166,667 | | | | | | |
Outstanding amount | | | $ 8,500,000 | 9,000,000 | | | |
Term Loan Facility | Wells Fargo | Prime rate | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | prime rate | | | | |
Term Loan Facility | Wells Fargo | LIBOR | | | | | | | |
Long-term debt. | | | | | | | |
Variable interest rate basis | | | LIBOR | | | | |
Letter Of Credit | | | | | | | |
Long-term debt. | | | | | | | |
Aggregate outstanding amount | | | | $ 3,300,000 | | | |