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 options awarded to employees as compensation.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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No definition available.

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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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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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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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STOCK BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ 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						4,800,000
Weighted average grant date fair value per option granted				$ 7.67
Total unrecognized compensation expense for unvested options		$ 7.4		$ 7.4		$ 0.1
Unrecognized compensation expense for unvested options, recognition period				3 years
Compensation expenses		$ 2.1	$ 2.9	$ 10.4	$ 10.0	13.2	$ 13.4	$ 118.4
Non-cash charge from accelerated vesting of options								$ 104.4
Restricted stock units (RSUs)
Stock Based Compensation
Total unrecognized compensation expense for unvested options						44.7
Deferred stock units
Stock Based Compensation
Total unrecognized compensation expense for unvested options						0.2
2012 Plan
Stock Based Compensation
Shares authorized to be awarded		8,800,000		8,800,000
Weighted average grant date fair value per option granted							$ 10.84	$ 20.84
Vesting period (in years)	3 years
Expiration period (in years)	10 years
Total unrecognized compensation expense for unvested options						$ 12.2
Unrecognized compensation expense for unvested options, recognition period						4 years
2012 Plan \| Maximum
Stock Based Compensation
Shares authorized to be awarded						8,800,000
2018 Plan
Stock Based Compensation
Shares authorized to be awarded		4,800,000		4,800,000
Weighted average grant date fair value per option granted						$ 7.22