Stock-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2020

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

Summary of stock-based compensation expense

	Three Months Ended June 30,				Nine Months Ended June 30,
	2020		2019		2020		2019
Restricted stock units	$	3,348	$	4,881	$	11,361	$	13,764
Employee stock purchase plan		377		359		987		773
Total stock-based compensation expense	$	3,725	$	5,240	$	12,348	$	14,537

Restricted Stock Unit Activity

		Time-Based	Stock	Performance-
	Total Units	Units	Grants	Based Units
Nine months ended June 30, 2020	411,967	163,390	27,007	221,570
Nine months ended June 30, 2019	792,103	330,006	38,708	423,389

		Weighted
		Average
		Grant-Date
	Shares	Fair Value
Outstanding at September 30, 2019	1,782,726	$	24.63
Granted	411,967		46.52
Vested	(898,222)		26.03
Forfeited	(105,410)		34.94
Outstanding at June 30, 2020	1,191,061		36.08