INCOME TAXES (Details) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016	Jan. 01, 2016
Provision for income taxes
Federal - current		$ (82,000)	$ 1,329,000		$ 5,283,000
State and local - current		522,000	930,000		1,359,000
Deferred		(2,550,000)	8,725,000		3,914,000
Tax (benefit) expense		$ (2,110,000)	$ 10,984,000		$ 10,556,000
Reconciliation of the statutory to the effective rate
Tax provision using statutory rate (as a percent)		35.00%	35.00%		35.00%
State and local taxes, net of Federal benefit (as a percent)		5.70%	4.30%		4.40%
Valuation allowance (as a percent)		0.10%	(0.40%)		0.20%
Permanent differences (as a percent)		0.30%	(0.50%)		0.30%
Legal settlement related (as a percent)		0.00%			(5.40%)
Total effective income tax rate reconciliation (as a percent)		41.10%	38.40%		34.50%
Stock-based compensation and merger related (as a percent)		(0.60%)
Impact of the Tax Act (as a percent)		(52.00%)
Tax provision		(11.50%)	38.40%		34.50%
Tax benefit		$ 9,500,000
Favorable impact of Stock-based compensation and merger		2,100,000
Increase in valuation allowance due to a change in expected realizability of deferred tax assets for states operating loss carry-forwards		400,000
Deferred tax assets
Non-deductible reserves and allowances		10,912,000	$ 12,688,000
Insurance accruals		2,227,000	3,506,000
Net operating loss carryforwards		5,062,000	5,229,000
Deferred tax assets, gross		18,201,000	21,423,000
Valuation allowance		(2,893,000)	(2,487,000)
Total deferred tax assets		15,308,000	18,936,000
Deferred tax liabilities
Goodwill & intangibles		(30,993,000)	(38,706,000)
Joint venture interests		(1,911,000)
Accelerated depreciation		(999,000)	(1,375,000)
Total deferred tax liabilities		(33,903,000)	(40,081,000)
Net deferred tax liabilities		(18,595,000)	(21,145,000)
Net operating loss carry-forwards		8,100,000
Valuation allowance		800,000
Book value of goodwill not deductible for tax purposes		105,100,000
Changes in unrecognized tax benefits
Balance		3,558,000	2,470,000	$ 1,186,000
Decreases related to positions taken on items from prior years			(94,000)
Increases related to positions taken in the current year		269,000	1,182,000	1,284,000
Lapse of statute of limitations		(99,000)
Balance		3,728,000	$ 3,558,000	$ 2,470,000	$ 2,470,000
Forecast
Reconciliation of the statutory to the effective rate
Tax provision using statutory rate (as a percent)	21.00%
State
Deferred tax liabilities
Net operating loss carry-forwards		46,300,000
Valuation allowance		$ 37,600,000