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SHAREHOLDERS’ EQUITY (Tables)

12 Months Ended

Dec. 27, 2019

Summary of option activity and changes during the period

							Weighted-
				Weighted-			Average
				Average			Remaining
				Exercise			Contractual
		Options		Price			Term
		(in thousands)					(in years)
Outstanding at December 28, 2018		1,252		$	16.87		6.62
Granted		—			—		—
Exercised		(115)			8.08		—
Forfeited or expired		(13)			14.97		—
Outstanding at December 27, 2019		1,124		$	17.80		6.06
Vested and expected to vest at December 27, 2019		1,124		$	17.80		6.06
Exercisable at December 27, 2019		958		$	15.48		5.68

							Weighted-
				Weighted-			Average
				Average			Remaining
				Exercise			Contractual
		Options		Price			Term
		(in thousands)					(in years)
Outstanding at December 29, 2017		1,207		$	14.04		7.02
Granted		158			31.54		—
Exercised		(85)			7.85		—
Forfeited or expired		(28)			5.07		—
Outstanding at December 28, 2018		1,252		$	16.87		6.62
Vested and expected to vest at December 28, 2018		1,252		$	16.87		6.62
Exercisable at December 28, 2018		838		$	12.20		5.58

							Weighted-
				Weighted-			Average
				Average			Remaining
				Exercise			Contractual
		Options		Price			Term
		(in thousands)					(in years)
Outstanding at December 30, 2016		1,311		$	10.15		6.69
Granted		199			30.28		—
Exercised		(271)			7.02		—
Forfeited or expired		(32)			15.65		—
Outstanding at December 29, 2017		1,207		$	14.04		7.02
Vested and expected to vest at December 29, 2017		1,207		$	14.04		7.02
Exercisable at December 29, 2017		660		$	8.84		5.58

Summary of the status of the nonvested options and changes in nonvested options

				Weighted-
				Average
				Grant-Date
		Options		Fair Value
		(in thousands)
Nonvested at December 28, 2018		414		$	8.69
Granted		—			—
Vested		(242)			9.43
Forfeited		(6)			10.87
Nonvested at December 27, 2019		166			12.15

				Weighted-
				Average
				Grant-Date
		Options		Fair Value
		(in thousands)
Nonvested at December 29, 2017		547		$	6.43
Granted		158			12.73
Vested		(263)			7.29
Forfeited		(28)			5.07
Nonvested at December 28, 2018		414			8.69

				Weighted-
				Average
				Grant-Date
		Options		Fair Value
		(in thousands)
Nonvested at December 30, 2016		653		$	4.75
Granted		199			12.23
Vested		(273)			6.68
Forfeited		(32)			15.65
Nonvested at December 29, 2017		547			6.43

Schedule of assumptions

The risk‑free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The assumptions are as follows:

		2019			2018						2017
Expected volatility		34	%		37	%	-	38	%		38	%	-	41	%
Expected dividends		0	%					0	%					0	%
Expected term (in years)		6						6						6
Risk-free rate		2.49	%		2.65	%	-	2.78	%		1.86	%	-	2.08	%

The fair value of ESPP purchase rights issued is calculated using the Black‑Scholes valuation model that uses the assumptions noted in the following table. Purchase right under the ESPP are generally granted on either January 1 or July 1 of each year. The assumptions are as follows:

		2019				2018				2017
Weighted-average expected term (in years)			.5				.5				.5
Risk-Free interest Rate			2.3	%			1.4	%			0.65	%
Stock Price Volatility			35.6	%			37.9	%			40.7	%
Dividend yield			0	%			0	%			0	%
Fair Value		$	33.01			$	26.86			$	23.02

Restricted stock

Summary of restricted stock activity

				Weighted-
				Average
		Restricted Stock		Grant Date Fair Value
		(in thousands)
Outstanding at December 28, 2018		64		$	22.28
Awarded		37			35.60
Vested		(43)			18.90
Forfeited		—			—
Outstanding at December 27, 2019		58		$	33.33
Outstanding at December 29, 2017		87		$	17.67
Awarded		22			28.17
Vested		(45)			16.09
Forfeited		—			—
Outstanding at December 28, 2018		64		$	22.28
Outstanding at December 30, 2016		99		$	11.37
Awarded		28			31.53
Vested		(40)			33.02
Forfeited		—			—
Outstanding at December 29, 2017		87		$	17.67

Performance Shares

Summary of restricted stock activity

		Performance-Based		Weighted-Average
		Restricted Stock Unit		Grant Date Fair Value
		(in thousands)
Outstanding at December 28, 2018		280		$	21.94
Awarded		329			28.99
Released		(175)			21.94
Forfeited		(3)			27.28
Outstanding at December 27, 2019		431		$	27.28
Outstanding at December 29, 2017		—		$	—
Awarded		280			21.94
Vested		—			—
Forfeited		—			—
Outstanding at December 28, 2018		280		$	21.94

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