Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2019

Stockholders' Equity

Summary of assumptions used for the valuation of the RSUs with performance and market-based vesting that were granted

The following table includes the assumptions used for the valuation of the RSUs with performance and market-based vesting that were granted during fiscal 2019:

	RSUs granted during the year ended September 30, 2019
Date of grant	November 21, 2018	April 1, 2019
Grant date fair value	$67.40	$59.29
Performance period begins	November 21, 2018	April 1, 2019
Performance period ends	September 30, 2021	September 30, 2021
Risk-free interest rate	2.8%	2.8%
Expected volatility	34%	34%

Summary of RSU activity

The following table summarizes our RSU activity:

	Unvested Restricted Stock Units with Service-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2017	366,331	$	45.99
Granted	165,271		61.06
Vested	(147,832)		46.86
Forfeited	(17,310)		48.62
Unvested at September 30, 2018	366,460	$	52.31
Granted	239,874		63.25
Vested	(145,409)		50.76
Forfeited	(38,831)		54.67
Unvested at September 30, 2019	422,094	$	58.84

	Unvested Restricted Stock Units with Performance-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2017	678,856	$	46.59
Granted	179,162		61.40
Vested	—		—
Forfeited	(222,390)		48.46
Unvested at September 30, 2018	635,628	$	50.11
Granted	—		—
Vested	—		—
Forfeited	(320,366)		44.63
Unvested at September 30, 2019	315,262	$	55.67

	Unvested Restricted Stock Units with Performance and Market-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2017	—	$	—
Granted	—		—
Vested	—		—
Forfeited	—		—
Unvested at September 30, 2018	—	$	—
Granted	237,616		66.79
Vested	—		—
Forfeited	(10,214)		67.40
Unvested at September 30, 2019	227,402	$	66.77

Schedule of stock-based compensation expense related to stock-based awards

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

	Years Ended September 30,
	2019		2018		2017
Cost of sales	$	1,766	$	1,096	$	338
Selling, general and administrative		13,722		6,419		4,674
	$	15,488	$	7,515	$	5,012