Share Based Compensation (Tables)

12 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock options, activity

A summary of the stock option activity for the years ended September 30, 2021 and 2020 is presented below:

(In thousands, except per share amounts)	Options	Weighted Average Exercise Price/Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2019	8,619	8.15		6.3 years	$	80,826
Granted	823	23.52
Exercised	(1,834)	5.62
Forfeited	(172)	15.54
Cancelled	(6)	20.60
Expired	—	—
Outstanding at September 30, 2020	7,430	$	10.30	5.9 years	$	83,152
Granted	612	$	24.78
Exercised	(2,884)	$	6.81
Forfeited	(67)	$	21.25
Cancelled	(1)	16.63
Expired	—	—
Outstanding at September 30, 2021	5,090	$	13.87	5.9 years	$	120,611
Options exercisable at September 30, 2021	3,189	$	9.72	4.6 years	$	88,776
Options vested and expected to vest at September 30, 2021	5,047	$	13.79	5.9 years	$	119,992

Schedule of Nonvested Share Activity

A summary of the status of the Company's nonvested stock options as of and for the years ended September 30, 2021, 2020 and 2019 is presented below.

	2021			2020			2019
(In thousands, except per share amounts)	Shares	Weighted Average Grant Date Fair Value/Share		Shares	Weighted Average Grant Date Fair Value/Share		Shares	Weighted Average Grant Date Fair Value/Share
Nonvested at beginning of period	2,166	$	5.56	2,379	$	4.96	3,335	$	4.11
Granted	612	$	9.00	823	$	6.06	1,114	$	3.87
Vested	(810)	$	5.48	(864)	$	4.52	(1,559)	$	2.61
Forfeited	(67)	$	6.82	(172)	$	4.94	(511)	$	4.38
Nonvested at end of period	1,901	$	6.69	2,166	$	5.56	2,379	$	4.96

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following is a summary of the RSU activity for the years ended September 30, 2021 and 2020.

	Shares	Weighted Average Grant Date Fair Value/Share
Outstanding at September 30, 2019	2,002	$	17.45
Granted	394	$	23.05
Vested	(1,555)	$	18.79
Forfeited	(91)	$	15.35
Outstanding at September 30, 2020	750	$	17.86
Granted	731	$	25.98
Vested	(240)	$	17.55
Forfeited	(25)	$	20.31
Cancelled	(7)	$	21.22
Outstanding at September 30, 2021	1,209	$	22.77
Expected to vest at September 30, 2021	1,165	$	22.67

The following is a summary of the Special PSU activity for the year ended September 30, 2021.

(In thousands, except per share amounts)	Shares	Weighted Average Grant Date Fair Value/Share
Granted	469	$	16.92
Nonvested at end of period	469	$	16.92
Expected to vest	426	$	16.92

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Reported non-cash share-based compensation expense was classified on the Consolidated Statements of Operations as shown in the following table:

	Year Ended September 30,
	2021		2020		2019
Cost of services	$	143	$	91	$	142
General and administrative	15,381		10,418		19,761
	$	15,524	$	10,509	$	19,903

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Option valuation assumptions for options granted are as follows:

	Year Ended September 30,
	2021	2020	2019
Expected volatility	38.3% - 56.7%	24.2% - 77.1%	26.3% - 30.0%
Expected dividends	—	—	—
Expected term (in years)	5.3 - 6.0	5.4 - 6.0	5.6 - 6.0
Risk free rate	0.4% - 0.9%	0.2% - 1.7%	1.5% - 2.6%
Grant date fair value per share of options granted	$8.12 - $19.76	$5.33 - $8.56	$3.14 - $7.06