Stockholders' Equity (Tables)

3 Months Ended

Dec. 31, 2019

Stockholders' Equity

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

The following tables include the assumptions used for the valuation of the RSUs with performance and market-based vesting that were granted during fiscal 2019 and 2020:

	RSUs granted during fiscal 2020
Date of grant	November 29, 2019
Grant date fair value	$52.51
Performance period begins	November 29, 2019
Performance period ends	September 30, 2022
Risk-free interest rate	1.6%
Expected volatility	41%
	RSUs granted during fiscal 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, 2019	422,094	$	58.84
Granted	329,918		59.90
Vested	(148,996)		56.07
Forfeited	(23,793)		60.14
Unvested at December 31, 2019	579,223	$	60.10

	Unvested Restricted Stock Units with Performance-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2019	315,262	$	55.67
Granted	—		—
Vested	—		—
Forfeited	(174,824)		47.36
Unvested at December 31, 2019	140,438	$	61.40

	Unvested Restricted Stock Units with Performance and Market-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2019	227,402	$	66.77
Granted	346,826		52.51
Vested	—		—
Forfeited	(33,874)		59.87
Unvested at December 31, 2019	540,354	$	58.05

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):

	Three Months Ended
	December 31,
	2019		2018
Cost of sales	$	539	$	313
Selling, general and administrative		3,938		2,407
	$	4,477	$	2,720