Stock-Based Compensation

Stock-based compensation expense was attributable to:



	Three Months Ended				Nine Months Ended
	June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
	(In thousands)
Stock options	$	1,362	$	362	$	5,105	$	1,292
Restricted stock units, including performance based awards	8,399		6,927		23,593		25,616
Total	$	9,761	$	7,289	$	28,698	$	26,908

Stock-based compensation expense was recognized as follows:



	Three Months Ended				Nine Months Ended
	June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
	(In thousands)
Cost of sales	$	2,055	$	1,879	$	6,354	$	6,778
Selling, general and administrative	7,490		5,276		22,042		19,492
Research and development	216		134		302		638
Total	$	9,761	$	7,289	$	28,698	$	26,908

During the second quarter of 2018, the Company's stockholders approved the reservation of an additional 1.8 million shares of common stock for future issuance under the Company's 2009 Incentive Plan. As of June 30, 2018, an aggregate of 10.3 million shares were authorized for future issuance under the Company's stock plans, of which 6.8 million of such shares were issuable upon exercise of outstanding options and delivery of shares upon vesting of restricted stock units and 3.5 million shares of common stock were available for future grant.

Stock Options

Stock option activity was as follows:



	Number of Shares		Weighted- Average Exercise Price ($)	Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value of In-The-Money Options ($)
	(In thousands)				(In thousands)
Outstanding as of September 30, 2017	3,568		11.83	3.82	90,327
Granted	200		38.45
Exercised/Cancelled/Forfeited/Expired	(381	)	11.47
Outstanding as of June 30, 2018	3,387		13.44	3.64	58,397
Vested and expected to vest as of June 30, 2018	3,385		13.44	3.63	58,384
Exercisable as of June 30, 2018	3,201		12.16	3.34	58,170

The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value of in-the-money options that would have been received by the option holders had all option holders exercised such options at the Company's closing stock price on the date indicated.

Restricted Stock Units

Activity with respect to the Company's restricted stock units was as follows:



	Number of Shares		Weighted- Average Grant Date Fair Value ($)	Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($)
	(In thousands)				(In thousands)
Outstanding as of September 30, 2017	3,359		27.56	1.51	124,800
Granted	1,098		33.52
Vested/Forfeited/Cancelled	(1,089	)	25.18
Outstanding as of June 30, 2018	3,368		30.27	1.46	101,728
Expected to vest as of June 30, 2018	2,553		29.60	1.46	77,110

As of June 30, 2018, unrecognized compensation expense of $43 million is expected to be recognized over a weighted average period of 1.5 years. Additionally, as of June 30, 2018, unrecognized compensation expense related to performance-based restricted stock units for which achievement of the performance criteria is not currently considered probable was $20 million.