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Share Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stock options, activity
A summary of the stock option activity for the years ended September 30, 2019 and 2018 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, 2017
9,060

 
5.18

 
7.5 years
 
 
Granted
1,380

 
20.94

 
 
 
 
Exercised
(1,303
)
 
4.80

 
 
 
 
Forfeited
(164
)
 
10.37

 
 
 
 
Expired
—

 
—

 
 
 
 
Outstanding at September 30, 2018
8,973

 
$
7.57

 
6.9 years
 
$
95,864

Granted
1,114

 
$
12.74

 
 
 
 
Exercised
(930
)
 
$
5.22

 
 
 
 
Forfeited
(511
)
 
$
12.43

 
 
 
 
Cancelled
(27
)
 
20.88

 
 
 
 
Expired
—

 
—

 
 
 
 
Outstanding at September 30, 2019
8,619

 
$
8.15

 
6.3 years
 
$
80,826

Options exercisable at September 30, 2019
6,240

 
$
5.70

 
5.4 years
 
$
71,757

Options vested and expected to vest at September 30, 2019
8,560

 
$
8.11

 
6.3 years
 
$
80,606
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, 2019, 2018 and 2017 is presented below.
 
2019
 
2018
 
2017
(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
3,335

 
$
4.11

 
4,300

 
$
1.36

 
5,931

 
$
1.15

Granted
1,114

 
$
3.87

 
1,380

 
$
7.91

 
1,039

 
$
2.12

Vested
(1,559
)
 
$
2.61

 
(2,180
)
 
$
1.20

 
(2,002
)
 
$
1.23

Forfeited
(511
)
 
$
4.38

 
(165
)
 
$
3.27

 
(668
)
 
$
1.00

Nonvested at end of period
2,379

 
$
4.96

 
3,335

 
$
4.11

 
4,300

 
$
1.36
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, 2019 and 2018. On November 2, 2019, 1,158 stock-settled RSUs vested, resulting in the issuance of 739 shares of common stock to the grantees and 419 shares of common stock to treasury to satisfy withholding tax obligations.
 
Shares
 
Weighted Average Grant Date Fair Value/Share
Outstanding at September 30, 2017
—

 
$
—

Granted
1,224

 
$
20.88

Forfeited
(11
)
 
$
20.88

Outstanding at September 30, 2018
1,213

 
$
20.88

Granted
883

 
$
12.69

Vested
(24
)
 
$
20.75

Forfeited
(70
)
 
$
15.84

Outstanding at September 30, 2019
2,002

 
$
17.45

Vested and expected to vest at September 30, 2019
1,946

 
$
17.50
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,
 
2019
 
2018
 
2017
Cost of services
$
142

 
$
80

 
$
43

General and administrative
19,761

 
15,662

 
2,208

 
$
19,903

 
$
15,742

 
$
2,251
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,
 
2019
 
2018
 
2017
Expected volatility
26.3% -30.0 %
 
23.5% - 34.3%
 
25.30% ‑ 28.70%
Expected dividends
—
 
—
 
—
Expected term (in years)
5.6 - 6.0
 
6.0 - 6.1
 
6.0 - 6.1
Risk free rate
1.5% - 2.6%
 
2.5% - 2.8%
 
1.89% ‑ 1.93%
Grant date fair value per share of options granted
$3.14 - $7.06
 
$5.58 - $7.96
 
$2.13 ‑ $2.41