Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of share-based compensation awards.

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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Stock Based Compensation
Compensation expenses	$ 4.3	$ 4.1	$ 8.3	$ 7.1
Total unrecognized compensation expense for unvested options	8.8		$ 8.8
Unrecognized compensation expense for unvested options, recognition period			3 years
Weighted average fair value at date of grant			$ 7.33
Stock-Based Compensation Plans \| First anniversary of the grant date
Stock Based Compensation
Vest percentage			0.33%
Stock-Based Compensation Plans \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vest percentage			0.16%
Restricted stock units (RSUs)
Stock Based Compensation
Other than options granted (in shares)			307,000
Unrecognized compensation expense	6.0		$ 6.0
Restricted stock units (RSUs) \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)			12,314
Restricted stock units (RSUs) \| Various employees
Stock Based Compensation
Options granted (in shares)			294,735
Vesting period (in years)			10 years
Performance-based RSU
Stock Based Compensation
Unrecognized compensation expense	41.7		$ 41.7
Stock options
Stock Based Compensation
Options granted (in shares)			541,000
Stock options \| Various employees
Stock Based Compensation
Options granted (in shares)			540,952
Vesting period (in years)			10 years
Deferred stock units
Stock Based Compensation
Other than options granted (in shares)			10,000
Unrecognized compensation expense	$ 0.2		$ 0.2
Deferred stock units \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)			9,727
2012 Plan
Stock Based Compensation
Shares authorized to be awarded	8,800,000		8,800,000
2018 Plan
Stock Based Compensation
Shares authorized to be awarded	4,800,000		4,800,000