Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2023

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of stock-based compensation expense

	Three Months Ended March 31,				Six Months Ended March 31,
	2023		2022		2023		2022
Restricted stock units	$	3,634	$	8,058	$	5,393	$	15,255
Employee stock purchase plan		356		599		703		1,293
Total stock-based compensation expense	$	3,990	$	8,657	$	6,096	$	16,548

Restricted Stock Unit Activity

		Time-Based	Stock	Performance-
	Total Units	Units	Grants	Based Units
Six months ended March 31, 2023	572,111	356,410	—	215,701
Six months ended March 31, 2022	228,468	101,706	16,286	110,476

		Weighted
		Average
		Grant-Date
	Shares	Fair Value
Outstanding at September 30, 2022	538,238	$	71.99
Granted	572,111		58.21
Vested	(261,618)		55.66
Forfeited	(81,878)		78.66
Outstanding at March 31, 2023	766,853		67.68