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INCOME TAXES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Uncertain Tax Benefits
Gross unrecognized tax benefits	$ 20,100,000		$ 20,100,000
Net unrecognized tax benefits	15,000,000.0		15,000,000.0
Net unrecognized tax benefits that would impact effective tax rate if recognized	10,300,000		10,300,000
Gross accrued interest	4,500,000		4,500,000
Net accrued interest	3,500,000		3,500,000
Penalties accrued	0		0
Other Tax Matters
Income tax provision	2,800,000	$ 1,700,000	11,500,000	$ 6,200,000
Pre-tax income (loss) from continuing operations	$ 24,000,000.0	$ 8,500,000	$ 52,700,000	$ 45,100,000
Effective income tax rate (as a percent)	11.70%	20.00%	21.80%	13.70%
Tax benefit from revision of estimate related to taxation of foreign earnings	$ 1,900,000		$ 1,900,000
Excess tax benefits from stock-based compensation awards vested			(1,700,000)	$ (1,000,000.0)
Tax benefits related to U.S. tax credits and incentives			1,300,000
Tax benefit related to reductions in valuation allowances				$ 1,700,000
Maximum
Uncertain Tax Benefits
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range	$ 10,000,000.0		$ 10,000,000.0

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