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SHAREHOLDERS’ EQUITY - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Fully-vested options
Stock price at the end of the year (in dollars per share)	$ 31.21
Stock options
Fully-vested options
Intrinsic value of the fully-vested options (in dollars)	$ 15,169,000
Options
Outstanding (in shares)	1,252	1,207	1,311
Granted (in shares)		158	199
Exercised (in shares)	(115)	(85)	(271)
Forfeited or expired (in shares)	(13)	(28)	(32)
Outstanding (in shares)	1,124	1,252	1,207	1,311
Vested and expected to vest (in shares)	1,124	1,252	1,207
Exercisable (in shares)	958	838	660
Weighted-Average Exercise Price
Outstanding (in dollars per share)	$ 16.87	$ 14.04	$ 10.15
Granted (in dollars per share)		31.54	30.28
Exercised (in dollars per share)	8.08	7.85	7.02
Forfeited or expired	14.97	5.07	15.65
Outstanding (in dollars per share)	17.80	16.87	14.04	$ 10.15
Vested (in dollars per share)	17.80	16.87	14.04
Exercisable (in dollars per share)	$ 15.48	$ 12.20	$ 8.84
Weighted-Average Remaining Contractual Term
Outstanding	6 years 22 days	6 years 7 months 13 days	7 years 7 days	6 years 8 months 9 days
Vested	6 years 22 days	6 years 7 months 13 days	7 years 7 days
Exercisable	5 years 8 months 5 days	5 years 6 months 29 days	5 years 6 months 29 days

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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