Stockholders' Equity (Tables)

3 Months Ended

Dec. 31, 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, 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	234,899		60.99
Vested	(226,934)		58.34
Forfeited	(11,147)		59.85
Unvested at December 31, 2020	551,241	$	59.64

	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 December 31, 2020	—	$	—

	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	(11,690)		50.77
Unvested at December 31, 2020	737,056	$	53.88

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,
	2020		2019
Cost of sales	$	601	$	539
Selling, general and administrative		4,078		3,938
	$	4,679	$	4,477