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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 30, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
United States |  | $ 42,336 | $ 50,773 | $ 84,101 | $ 86,197
Foreign |  | 6,749 | 17,634 | 17,996 | 37,534
Earnings before income taxes |  | $ 49,085 | $ 68,407 | $ 102,097 | $ 123,731
Unremitted foreign earnings | $ 400,000 |  |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Liability | 9,890 |  |  |  |
Federal |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense | 10,373 |  |  |  |
State |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense | $ 1,300 |  |  |  |

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