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SHAREHOLDERS’ EQUITY - Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
2008 Plan
Weighted-Average Grant Date Fair Value
Outstanding (in dollars per share)	$ 21.94
Awarded (in dollars per share)	28.99	$ 21.94
Vested (in dollars per share)	21.94
Forfeited (in dollars per share)	27.28
Outstanding (in dollars per share)	$ 27.28	$ 21.94
Stock options
Unrecognized compensation expense
Unrecognized compensation expense related to non-vested stock options (in dollars)	$ 1,489,000	$ 3,598,000	$ 3,514,000
Awards granted that were immediately vested (in shares)	0	0	0
Restricted stock
Unrecognized compensation expense
Unrecognized compensation expense related to non-vested stock other than options (in dollars)	$ 1,502,000	$ 1,012,000	$ 1,162,000
Restricted stock | 2008 Plan
Restricted Stock
Outstanding (in shares)	64,000	87,000	99,000
Awarded (in shares)	37,000	22,000	28,000
Vested (in shares)	(43,000)	(45,000)	(40,000)
Outstanding (in shares)	58,000	64,000	87,000
Weighted-Average Grant Date Fair Value
Outstanding (in dollars per share)	$ 22.28	$ 17.67	$ 11.37
Awarded (in dollars per share)	35.60	28.17	31.53
Vested (in dollars per share)	18.90	16.09	33.02
Outstanding (in dollars per share)	$ 33.33	$ 22.28	$ 17.67
Performance Shares
Unrecognized compensation expense
Unrecognized compensation expense related to non-vested stock other than options (in dollars)	$ 21,515,000	$ 12,254,000	$ 0
Weighted-average period over which unrecognized expense is expected to be recognized	1 year 26 days
Performance Shares | 2008 Plan
Restricted Stock
Outstanding (in shares)	280,000
Awarded (in shares)	329,000	280,000
Vested (in shares)	(175,000)
Forfeited (in shares)	(3,000)
Outstanding (in shares)	431,000	280,000

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