Stockholders’ Equity (Tables)

6 Months Ended

Mar. 31, 2019

Stockholders’ Equity

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

	RSU's granted during the six
	months ended March 31, 2019
Date of grant	November 21, 2018
Closing average share value (mean)	$68.56
Performance period begins	October 1, 2018
Performance period ends	September 30, 2021
Risk-free interest rate	2.8%
Expected volatility	34%

Summary of RSU activity

	Unvested Restricted Stock Units
		Weighted-Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2018	366,460	$	52.31
Granted	217,385		63.63
Vested	(131,990)		50.43
Forfeited	(22,446)		52.53
Unvested at March 31, 2019	429,409	$	58.60

	Unvested Restricted Stock Units with Performance Based Vesting
		Weighted-Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2018	635,628	$	50.11
Granted	—		—
Vested	—		—
Forfeited	(308,111)		44.22
Unvested at March 31, 2019	327,517	$	55.65

	Unvested Restricted Stock Units with Performance and Market Based Vesting
		Weighted-Average
	Number of Shares	Grant-Date Fair Value
Unvested at September 30, 2018	—	$	—
Granted	219,890		67.40
Vested	—		—
Forfeited	(2,534)		67.40
Unvested at March 31, 2019	217,356	$	67.40

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,
	2019		2018		2019		2018
Cost of sales	$	425	$	216	$	738	$	372
Selling, general and administrative		3,213		654		5,620		2,125
	$	3,638	$	870	$	6,358	$	2,497