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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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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Percentage of vesting of share-based compensation awards.

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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2016	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Stock Based Compensation
Shares authorized to be awarded (in shares)						4,800,000
Compensation expenses		$ 2.1	$ 2.9	$ 10.4	$ 10.0	$ 13.2	$ 13.4	$ 118.4
Total unrecognized compensation expense for unvested options		7.4		$ 7.4		$ 0.1
Unrecognized compensation expense for unvested options, recognition period				3 years
Stock-Based Compensation Plans \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vest percentage				0.16%
Stock-Based Compensation Plans \| First anniversary of the grant date
Stock Based Compensation
Vest percentage				0.33%
Restricted Stock Units
Stock Based Compensation
Other than options granted (in shares)				338,000		7,000
Total unrecognized compensation expense for unvested options						$ 44.7
Unrecognized compensation expense		6.0		$ 6.0
Restricted Stock Units \| Various employees
Stock Based Compensation
Options granted (in shares)				326,059
Vesting period (in years)				10 years
Restricted Stock Units \| Board of Directors
Stock Based Compensation
Options granted (in shares)						6,666
Other than options granted (in shares)				12,314
Performance-Based Restricted Stock Units
Stock Based Compensation
Other than options granted (in shares)				0		1,426,000
Unrecognized compensation expense		40.6		$ 40.6
Stock Options
Stock Based Compensation
Options granted (in shares)				601,000
Stock Options \| Various employees
Stock Based Compensation
Options granted (in shares)				601,548
Deferred Stock Units
Stock Based Compensation
Other than options granted (in shares)				10,000		13,000
Total unrecognized compensation expense for unvested options						$ 0.2
Unrecognized compensation expense		$ 0.2		$ 0.2
Deferred Stock Units \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)				9,727
2018 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)		4,800,000		4,800,000
Options granted (in shares)						761,000
2018 Plan \| Stock Options
Stock Based Compensation
Options granted (in shares)						761,000
2012 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)		8,800,000		8,800,000
Vesting period (in years)	3 years
Total unrecognized compensation expense for unvested options						$ 12.2
Unrecognized compensation expense for unvested options, recognition period						4 years
2012 Plan \| Restricted Stock Units
Stock Based Compensation
Other than options granted (in shares)						385,241
2012 Plan \| Stock Options
Stock Based Compensation
Options granted (in shares)							77,000	166,000