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 |