Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2018

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

Stock-Based Compensation Expense

The following table reflects stock-based compensation expense recorded during the three and six months ended March 31, 2018 and 2017 (in thousands):

	Three Months Ended March 31,				Six Months Ended March 31,
	2018		2017		2018		2017
Restricted stock	$	5,097	$	4,225	$	9,699	$	6,590
Employee stock purchase plan		223		161		430		294
Total stock-based compensation expense	$	5,320	$	4,386	$	10,129	$	6,884

Restricted Stock Unit Activity

The following table reflects restricted stock units granted during the six months ended March 31, 2018 and 2017:

		Time-Based		Performance-
	Total Units	Units	Stock Grants	Based Units
Six months ended March 31, 2018	507,556	192,291	34,926	280,339
Six months ended March 31, 2017	1,008,111	377,213	42,560	588,338

The following table summarizes restricted stock unit activity for the six months ended March 31, 2018:

		Weighted
		Average
		Grant-Date
	Shares	Fair Value
Outstanding at September 30, 2017	2,474,011	$	12.34
Granted	507,556		33.61
Vested	(629,840)		13.16
Forfeited	(38,520)		16.25
Outstanding at March 31, 2018	2,313,207	$	16.89