Stock-Based Compensation

12 Months Ended

Sep. 30, 2018

Stock-Based Compensation

Stock-Based Compensation

NOTE 15—STOCK-BASED COMPENSATION

We recorded non-cash compensation expense related to stock-based awards as follows (in thousands):

	2018		2017		2016
Cost of sales	$	1,096	$	338	$	513
Selling, general and administrative		6,419		4,674		7,235
	$	7,515	$	5,012	$	7,748

As of September 30, 2018, there was $41.1 million of unrecognized compensation cost related to unvested RSUs. Based upon the expected forfeitures and the expected vesting of performance-based RSUs, the aggregate fair value of RSUs expected to ultimately vest is $24.5 million. This amount is expected to be recognized over a weighted-average period of 1.7 years.

We are required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods on a cumulative basis in the period the estimated forfeiture rate changes for all stock-based awards when significant events occur. We consider our historical experience with employee turnover as the basis to arrive at our estimated forfeiture rate. The forfeiture rate was estimated to be 12.5% per year as of September 30, 2018. To the extent the actual forfeiture rate is different from what we have estimated, stock-based compensation related to these awards will be different from our expectations.