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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Client receivables $ 376,302 $ 335,839
Contract assets (unbilled revenue) 113,311 96,297
Contract liabilities (current and long-term deferred revenue) 178,331  
Contract liabilities (customer contract deposits) $ 44,586 0
Calculated under Revenue Guidance in Effect before Topic 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Client receivables   335,839
Contract assets (unbilled revenue)   96,297
Contract liabilities (current and long-term deferred revenue)   125,882
Contract liabilities (customer contract deposits)   $ 0