INCOME AND OTHER TAXES (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Uncertain Tax Benefits
Gross unrecognized tax benefits	$ 16,800,000			$ 16,800,000
Net unrecognized tax benefits	13,500,000			13,500,000
Net unrecognized tax benefits that would impact effective tax rate if recognized	9,400,000			9,400,000
Gross accrued interest	4,700,000			4,700,000
Net accrued interest	3,600,000			3,600,000
Penalties accrued	0			0
Other Tax Matters
Income tax provision	5,800,000		$ 2,800,000	18,900,000	$ 11,500,000
Pre-tax income (loss) from continuing operations	$ 28,500,000		$ 24,000,000.0	$ 92,700,000	$ 52,700,000
Effective income tax rate (as a percent)	20.40%		11.70%	20.40%	21.80%
Tax benefits related to U.S. tax credits and incentives	$ 1,200,000			$ 1,200,000	$ 1,300,000
Tax benefit due to revision of a previous estimate			$ 1,900,000		(1,900,000)
Excess tax benefits from stock-based compensation awards vested				1,600,000	$ 1,700,000
Tax benefits associated with statute expirations		$ 500,000
Deferred social security payroll taxes due to CARES act	6,800,000			6,800,000
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