Stock-Based Compensation (Tables)

3 Months Ended

Dec. 31, 2020

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

Summary of stock-based compensation expense

	Three Months Ended December 31,
	2020		2019
Restricted stock units	$	6,144	$	4,092
Employee stock purchase plan		566		318
Total stock-based compensation expense	$	6,710	$	4,410

Restricted Stock Unit Activity

		Time-Based	Stock	Performance-
	Total Units	Units	Grants	Based Units
Three months ended December 31, 2020	281,693	122,921	42	158,730
Three months ended December 31, 2019	377,212	155,461	181	221,570

		Weighted
		Average
		Grant-Date
	Shares	Fair Value
Outstanding at September 30, 2020	1,183,009	$	36.10
Granted	281,693		68.49
Vested	(378,422)		35.10
Forfeited	(23,315)		40.41
Outstanding at December 31, 2020	1,062,965		44.94