DEBT (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 25, 2016 USD ($)	Sep. 27, 2015 USD ($)	Sep. 25, 2016 USD ($)	Sep. 27, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jul. 26, 2016 USD ($)	Aug. 31, 2015 USD ($)	Apr. 28, 2015 USD ($)
Line of Credit Facility [Line Items]
Total long-term debt		$ 280,855,000		$ 280,855,000		$ 204,484,000
Less: current maturities of long-term debt		(15,766,000)		(15,766,000)		(10,714,000)
Less: Net deferred financing costs related to Term Loan		(610,000)		(610,000)		(628,000)
Total long-term debt, less current maturities, net		$ 264,479,000		$ 264,479,000		$ 193,142,000
Debt instrument, covenant, maximum leverage ratio		3.00		3.00
Debt instrument, covenant, minimum interest coverage ratio				1.50
Interest paid		$ 2,000,000	$ 900,000	$ 4,900,000	$ 2,600,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused capacity, commitment fee percentage				0.225%		0.25%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.75%				2.00%
Debt instrument, effective interest rate		2.31%		2.31%		2.4375%
Prime Rate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.75%				1.00%
Debt instrument, effective interest rate		4.25%		4.25%		4.50%
Required [Member]
Line of Credit Facility [Line Items]
Consolidated total leverage ratio				3.00
Consolidated fixed charge coverage ratio				1.50
Scenario, Actual [Member]
Line of Credit Facility [Line Items]
Consolidated total leverage ratio				1.97
Consolidated fixed charge coverage ratio				3.12
Line of Credit [Member]
Line of Credit Facility [Line Items]
Total long-term debt		$ 190,246,000		$ 190,246,000		$ 137,520,000
Maximum borrowing capacity						300,000,000.0
Term Loan [Member]
Line of Credit Facility [Line Items]
Total long-term debt		90,609,000		90,609,000		66,964,000
The 2015 Credit Facility [Member] | The Lenders [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 360,000,000.0	$ 300,000,000.0	$ 250,000,000.0
The 2015 Credit Facility [Member] | The Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							269,400,000.0	$ 225,000,000.0	175,000,000.0
The 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | The Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term line of credit		190,000,000		190,000,000		133,000,000
The 2015 Credit Facility [Member] | Prime Rate [Member] | The Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term line of credit		200,000		200,000		$ 4,500,000
The 2015 Credit Facility [Member] | Term Loan [Member] | The Lenders [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 90,600,000.0		$ 75,000,000.0
Debt instrument, periodic payment				2,700,000
The 2015 Credit Facility [Member] | Term Loan [Member] | Scenario, Forecast [Member] | The Lenders [Member]
Line of Credit Facility [Line Items]
Debt instrument, periodic payment	$ 3,900,000
The 2015 Credit Facility [Member] | Same Day Advance Swing Line [Member] | The Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		10,000,000.0		10,000,000.0
The 2015 Credit Facility [Member] | Sub Facility, Standby Letters of Credit [Member] | The Lenders [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 10,000,000.0		$ 10,000,000.0