STOCK BASED COMPENSATION (Tables)

3 Months Ended

12 Months Ended

Mar. 30, 2019

Dec. 29, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary assumptions utilized to calculate fair value of stock options granted

	Three Months Ended
	March 30,
	2019
Expected option term	6 years
Expected stock price volatility	27%
Risk-free interest rate	2.5%
Expected dividend yield	–%

	Fiscal
	2018	2017	2016
Expected option term	6 years	5 - 6 years	6 years
Expected stock price volatility	35%	30%	30% - 35%
Risk-free interest rate	2.99%	2.05% - 2.18%	1.31% - 1.57%
Expected dividend yield	–%	–%	–%

Summary of the performance based RSUs, RSUs, and DSUs

A summary of the performance-based RSUs, RSUs, and DSUs is as follows for the periods indicated (in thousands, except per share data):

	Performance-Based
	Restricted Stock Units			Restricted Stock Units			Deferred Stock Units
		Weighted			Weighted			Weighted
	Number of	Average Grant		Number of	Average Grant		Number of	Average Grant
	RSUs	Date Fair Value		RSUs	Date Fair Value		DSUs	Date Fair Value
Balance, December 30, 2017	—	$	—	—	$	—	—	$	—
Granted	1,426		31.74	7		17.00	13		17.00
Vested	—		—	—		—	—		—
Forfeited/cancelled	(15)		31.74	—		—	—		—
Balance, December 29, 2018	1,411	$	31.74	7	$	17.00	13	$	17.00

Stock Options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock options

A summary of the stock options is as follows for the periods indicated (in thousands, except per share data):

				Weighted
				Average
		Weighted		Remaining	Aggregate
	Number of	Average Exercise		Contractual	Intrinsic
	Options	Price		Term (Years)	Value
Balance, December 31, 2015	5,488	$	1.27	7.41
Granted	166		50.80
Exercised	(1,564)		0.38
Forfeited/cancelled	(592)		0.73
Expired	—		—
Balance, December 31, 2016	3,498	$	4.10	5.99
Granted	77		53.51
Exercised	(156)		0.65
Forfeited/cancelled	(529)		5.71
Expired	(6)		46.63
Balance, December 30, 2017	2,884	$	5.22	6.10
Granted	761		18.00
Exercised	(560)		0.47
Forfeited/cancelled	(172)		47.91
Expired	(24)		53.55
Balance, December 29, 2018	2,889	$	6.56	6.48	$	23,844
Exercisable, December 29, 2018	1,733	$	2.36	5.11	$	21,596

Non-vested stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock options

The following is a summary of our non‑vested stock options for the periods indicated (in thousands, except per share data):

	Shares Under		Weighted
	Outstanding		Average Grant
	Options		Date Fair Value
Non-vested options at January 1, 2018	1,433	$	20.02
Granted	761		7.22
Forfeited (1)	(141)		17.83
Vested	(898)		16.94
Non-vested options at December 29, 2018	1,155	$	14.25

_________________________

Amount does not include 31,095 of vested stock options cancelled in June 2018.