Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation Expenses

Stock-based compensation expense was reported as follows on the consolidated statements of operations:

	Fiscal Year
(In thousands)	2022		2021		2020
Product costs	$	234	$	122	$	119
Research and development		1,424		1,298		896
Selling, general and administrative		5,399		4,443		4,438
Total stock-based compensation expense	$	7,057	$	5,863	$	5,453

Stock Option Fair Value Assumptions and Weighted Average Grant Date Fair Value of Stock Options Granted

tock option fair value assumptions and the weighted average grant date fair value of stock options granted were as follows:

	Fiscal Year
	2022			2021			2020
Stock option fair value assumptions:
Risk-free interest rate		1.49	%		0.40	%		1.41	%
Expected life (years)	4.6			4.6			4.6
Expected volatility		43	%		43	%		39	%
Dividend yield		—	%		—	%		—	%
Weighted average grant date fair value of stock options granted	$	15.96		$	14.71		$	14.13

Schedule of Stock Option Activity

Stock option activity was as follows:

(In thousands, except per share data)	Number of Shares			Weighted Average Exercise Price
Options outstanding at September 30, 2019		871		$	32.18
Granted		299			41.06
Exercised		(125	)		22.89
Forfeited and expired		(105	)		41.69
Options outstanding at September 30, 2020		940			35.18
Granted		274			40.95
Exercised		(248	)		24.22
Forfeited and expired		(44	)		44.58
Options outstanding at September 30, 2021		922			39.39
Granted		342			42.10
Exercised		(45	)		21.24
Forfeited and expired		(58	)		43.99
Options outstanding at September 30, 2022		1,161			40.66
Options vested and exercisable at September 30, 2022		546		$	39.44

Schedule of Restricted Stock Activity

Restricted Stock activity was as follows:

(In thousands, except per share data)	Number of Shares			Weighted Average Grant Date Fair Value
Unvested restricted stock awards at September 30, 2019		90		$	43.69
Granted		67			41.40
Vested		(43	)		38.74
Forfeited		(14	)		44.76
Unvested restricted stock awards at September 30, 2020		100			44.16
Granted		71			38.83
Vested		(48	)		44.07
Forfeited		(4	)		40.45
Unvested restricted stock awards at September 30, 2021		119			41.14
Granted		99			42.35
Vested		(55	)		42.98
Forfeited		(5	)		41.83
Unvested restricted stock awards at September 30, 2022		158		$	41.24