Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2021

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, 2020 and 2021:

	RSUs granted during fiscal 2021
Valuation Date	November 17, 2020
Grant date fair value per RSU	$57.71
Performance period begins	October 1, 2020
Performance period ends	September 30, 2023
Risk-free interest rate	0.2%
Expected volatility	50%
	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%

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, 2020	554,423	$	58.54
Granted	249,960		61.09
Vested	(230,975)		58.34
Forfeited	(116,969)		59.17
Unvested at March 31, 2021	456,439	$	59.88

	Unvested RSUs with Performance-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value per Share
Unvested at September 30, 2020	137,770	$	61.40
Granted	—		—
Vested	(110,247)		61.40
Forfeited	(27,523)		61.40
Unvested at March 31, 2021	—	$	—

	Unvested RSUs with Performance- and Market-Based Vesting
		Weighted Average
	Number of Shares	Grant-Date Fair Value per Share
Unvested at September 30, 2020	471,496	$	51.56
Granted	277,250		57.71
Vested	—		—
Forfeited	(20,542)		55.09
Unvested at March 31, 2021	728,204	$	53.80

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				Six Months Ended
	March 31,				March 31,
	2021		2020		2021		2020
Cost of sales	$	771	$	743	$	1,372	$	1,282
Selling, general and administrative		5,701		4,639		9,779		8,577
	$	6,472	$	5,382	$	11,151	$	9,859