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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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No definition available.

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STOCK BASED COMPENSATION (Details) - USD ($) $ in Millions			3 Months Ended
STOCK BASED COMPENSATION (Details) - USD ($) $ in Millions	Feb. 15, 2019	Feb. 13, 2019	Mar. 30, 2019	Mar. 31, 2018
Stock Based Compensation
Compensation expenses			$ 4.0	$ 3.0
Total unrecognized compensation expense for unvested options			$ 18.8
Unrecognized compensation expense for unvested options, recognition period			3 years
Restricted stock units (RSUs)
Stock Based Compensation
Unrecognized compensation expense			$ 0.1
Restricted stock units (RSUs) \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)		2,948
Restricted stock units (RSUs) \| Various employees
Stock Based Compensation
Options granted (in shares)	280,196
Vesting period (in years)	10 years
Performance-based RSU
Stock Based Compensation
Unrecognized compensation expense			42.7
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
Unrecognized compensation expense			$ 0.1
Deferred stock units \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)		1,141
2012 Plan
Stock Based Compensation
Shares authorized to be awarded			8,800,000
2018 Plan
Stock Based Compensation
Shares authorized to be awarded			4,800,000