LONG-TERM DEBT (Details) - USD ($)			9 Months Ended
	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