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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Life Insurance Contracts (Details)
$ in Millions
Dec. 30, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of life insurance contracts | contract 43 43
Face value of life insurance contracts | $ $ 66.4 $ 61.4