VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Allowance For Doubtful Accounts
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 192	$ 592
Additions: Charged To Costs and Expenses	74
Deductions: Credits to Costs and Expenses and Other Accounts	(133)	(400)
Balance at End of Period	132	192
Lease Termination Costs and Asset Retirement Obligations
Valuation and Qualifying Accounts
Balance at Beginning of Period	431	1,799
Additions: Charged To Costs and Expenses	182	511
Deductions: Credits to Costs and Expenses and Other Accounts	(605)	(1,879)
Balance at End of Period	$ 8	431
Corporate Severance
Valuation and Qualifying Accounts
Balance at Beginning of Period		355
Additions: Charged To Costs and Expenses		98
Deductions: Credits to Costs and Expenses and Other Accounts		$ (453)