Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2020

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 fiscal 2020:

	RSUs granted during fiscal 2020
Valuation Date	September 17, 2020
Grant date fair value per RSU	$41.13
Performance period begins	October 1, 2019
Performance period ends	September 30, 2022
Risk-free interest rate	0.1%
Expected volatility	52%
	RSUs granted during fiscal 2019
Valuation Date	November 21, 2018	April 1, 2019
Grant date fair value per RSU	$67.40	$59.29
Performance period begins	October 1, 2018	October 1, 2018
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 RSUs with Time-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value per Share
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
Granted	394,271		57.42
Vested	(173,689)		55.93
Forfeited	(88,253)		60.11
Unvested at September 30, 2020	554,423	$	58.54

	Unvested RSUs with Performance-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value per Share
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
Granted	—		—
Vested	—		—
Forfeited	(177,492)		47.57
Unvested at September 30, 2020	137,770	$	61.40

	Unvested RSUs with Performance- and Market-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value per Share
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
Granted	346,826		41.13
Vested	—		—
Forfeited	(102,732)		50.03
Unvested at September 30, 2020	471,496	$	51.56

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,
	2020		2019		2018
Cost of sales	$	2,837	$	1,766	$	1,096
Selling, general and administrative		19,391		13,722		6,419
Restructuring costs		500		—		—
	$	22,728	$	15,488	$	7,515