DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Pension and Other Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Decrease in company's benefit obligations from new mortality improvement scales	$ 1.3	$ 3.3