INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Jan. 01, 2015	Dec. 26, 2013
Operating Loss Carryforwards [Line Items]
Current tax benefit allocated directly to stockholders' equity for the exercise of stock options and dividends paid on restricted stock	$ 1.8	$ 1.6	$ 1.3
U.S. federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Valuation allowance	$ 34.9	$ 34.8
Net unrecognized tax benefits that would affect the effective tax rate, if recognized	6.8	7.1
Net unrecognized tax benefits that would result in an increase to the valuation allowance, if recognized	1.7	1.7
Accrued gross interest and penalties	2.2	2.0
Interest and penalties recognized during the period	0.3	$ 0.2	$ 0.0
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to expiration	102.1
Minimum
Operating Loss Carryforwards [Line Items]
Decrease in gross unrecognized tax benefits associated with state tax positions, minimum	$ 2.2
Minimum | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward period (in years)	7 years
Maximum
Operating Loss Carryforwards [Line Items]
Decrease in gross unrecognized tax benefits associated with state tax positions, minimum	$ 4.5
Maximum | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward period (in years)	20 years
Latest Tax Year | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ 0.1