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