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EQUITY-BASED COMPENSATION - Stock Options Outstanding and Exercisable (Details) - 2015 Incentive Award Plan	12 Months Ended
	Dec. 26, 2018 $ / shares shares
Twenty-One Dollars
Options Outstanding
Number Outstanding (in shares) | shares	1,339,274
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 3 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 21.00
Options Exercisable
Number Exercisable (in shares) | shares	661,694
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 3 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 21.00
Thirty-Four Point Sixty Two Dollars
Options Outstanding
Number Outstanding (in shares) | shares	10,415
Weighted Average Remaining Contractual Life (Years)	7 years 4 months 22 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 34.62
Options Exercisable
Number Exercisable (in shares) | shares	10,415
Weighted Average Remaining Contractual Life (Years)	7 years 4 months 22 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 34.62
Thirty-Six Point Forty One Dollars
Options Outstanding
Number Outstanding (in shares) | shares	1,108
Weighted Average Remaining Contractual Life (Years)	7 years 10 months 22 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 36.41
Options Exercisable
Number Exercisable (in shares) | shares	1,108
Weighted Average Remaining Contractual Life (Years)	7 years 10 months 22 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 36.41
Thirty-Eight Point Ninety One Dollars
Options Outstanding
Number Outstanding (in shares) | shares	5,150
Weighted Average Remaining Contractual Life (Years)	8 years 5 months 16 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 38.91
Options Exercisable
Number Exercisable (in shares) | shares	1,030
Weighted Average Remaining Contractual Life (Years)	8 years 5 months 16 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 38.91
Thirty-Nine Point Ninety-One Dollars [Member]
Options Outstanding
Number Outstanding (in shares) | shares	5,036
Weighted Average Remaining Contractual Life (Years)	9 years 2 months 25 days
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 39.91
Options Exercisable
Number Exercisable (in shares) | shares	0
Weighted Average Exercise Price (in USD per share) | $ / shares	$ 0.00

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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