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SHAREHOLDERS’ EQUITY - Nonvested Option Activity (Details) - Stock options - $ / shares shares in Thousands	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Nonvested Options
Nonvested outstanding (in shares)	414	547	653
Granted (in shares)		158	199
Vested (in shares)	(242)	(263)	(273)
Forfeited (in shares)	(6)	(28)	(32)
Nonvested outstanding (in shares)	166	414	547
Nonvested Options, Weighted Average Grant-Date Fair Value
Nonvested (in dollars per share)	$ 8.69	$ 6.43	$ 4.75
Granted (in dollars per share)		12.73	12.23
Vested (in dollars per share)	9.43	7.29	6.68
Forfeited (in dollars per share)	10.87	5.07	15.65
Nonvested (in dollars per share)	$ 12.15	$ 8.69	$ 6.43

X

- Definition

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

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Number of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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