Stock-based Compensation

As of September 28, 2014, the Company had five equity plans. Additional information regarding these plans is disclosed in the Annual Report.

Stock-based compensation expense, net of estimated forfeitures, is recognized on a straight-line basis over the vesting period for each stock option or restricted stock unit ("RSU") grant that is expected to vest at some point in the future. Forfeitures are estimated at the date of grant based on the Company's historical experience and future expectations.

The fair value of each stock option on the date of grant is estimated using the Black-Scholes-Merton option valuation model. The fair value of each RSU is based on the Fair Market Value (as defined in the 2013 Equity Incentive Plan) of the Company's common stock on the date of the grant.

There were no stock options granted during the quarter ended September 28, 2014. The following weighted average assumptions were used for the valuation of stock options granted during the fiscal year to date periods presented:



	Year to date ended
	September 28, 2014			September 29, 2013
Expected term	4.5 years			4.5 years
Expected volatility	46.9		%	56.9		%
Expected dividend yield	0.0		%	0.0		%
Risk-free interest rate	1.5		%	0.9		%
Estimated weighted average fair value per stock option granted	$	13.28		$	14.68

The assumptions used to calculate the fair value of stock options granted are evaluated and revised, if necessary, to reflect market conditions and the Company’s experience.

A summary of stock option activity for the year to date ended September 28, 2014 is as follows:



	Options (in thousands)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balance, December 30, 2013	1,493		$	41.93
Granted	79		33.00
Exercised	(93	)	24.43
Canceled	(302	)	52.34
Balance, September 28, 2014	1,177		$	40.04	5.46	$	519
Vested and expected to vest at September 28, 2014	1,148		$	40.21	5.39	$	517
Exercisable, September 28, 2014	886		$	42.08	4.60	$	496

A summary of RSU activity for the year to date ended September 28, 2014 is as follows:



	RSUs (in thousands)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balance, December 30, 2013	88		$	31.01
Granted	90		32.93
Vested	(34	)	31.50
Canceled	(25	)	32.54
Balance, September 28, 2014	119		$	32.01	1.38	$	3,519
Vested and expected to vest at September 28, 2014	103		$	37.42	1.29	$	3,057

The aggregate intrinsic value in the tables above are before applicable income taxes and represent the amount recipients would have received if all stock options had been exercised or RSUs had been released on the last business day of the period indicated, based on the closing stock price of the Company's common stock on such date.

The total intrinsic value of stock options exercised during the year to date ended September 28, 2014 was $1.0 million. During the year to date ended September 28, 2014, the total fair value of stock options vested was $2.4 million. As of September 28, 2014, the Company had total unrecognized compensation costs related to unvested stock options and RSUs of $6.6 million, before income taxes. The Company expects to recognize this cost over a weighted average period of 2.1 years for the options and 2.8 years for the RSUs.