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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2019
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Compensation expense is recorded ratably over the performance period of the award based on the estimated grant date fair value estimated at the grant date using a Monte Carlo simulation model, which included the following assumptions:
 
2019
Dividend yield
0.0
%
Expected volatility
27.3% - 30.9%

Risk-free interest rate
2.2% - 3.0%

Expected term (in years)
1 - 3
Stock Based Compensation Included in Consolidated Statements of Operations
 
Year Ended September 30,
 
2019
 
2018
 
2017
Cost of professional services and hosting
$
28,523

 
$
31,094

 
$
28,532

Cost of product and licensing
855

 
814

 
348

Cost of maintenance and support
1,314

 
3,322

 
2,161

Research and development
38,454

 
38,077

 
30,540

Sales and marketing
34,360

 
35,838

 
39,037

General and administrative
37,706

 
33,764

 
42,283

Total
$
141,212

 
$
142,909

 
$
142,901
Summary of Stock Options Activity
The table below summarizes activities related to stock options for the years ended September 30, 2019, 2018 and 2017:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value(a)
Outstanding at September 30, 2016
1,965,826

 
$
15.01

 
 
 
 

Granted
—

 
—

 
 
 
 

Exercised/Repurchased(b)
(1,932,286
)
 
$
14.98

 
 
 
 

Forfeited
—

 
—

 
 
 
 

Expired
(9,733
)
 
$
20.01

 
 
 
 

Outstanding at September 30, 2017
23,807

 
$
15.39

 
 
 
 

Granted
—

 
—

 
 
 
 
Exercised
(2,963
)
 
$
2.61

 
 
 
 

Forfeited
—

 
—

 
 
 
 

Expired
(1,700
)
 
$
15.99

 
 
 
 

Outstanding at September 30, 2018
19,144

 
$
17.31

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(3,314
)
 
$
7.22

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Expired
(4,528
)
 
$
17.89

 
 
 
 
Outstanding at September 30, 2019
11,302

 
$
20.04

 
2.6 years
 
$
0.1
 million
Exercisable at September 30, 2019
11,302

 
$
20.04

 
2.6 years
 
$
0.1
 million
Exercisable at September 30, 2018
19,144

 
 

 
 
 
 

Exercisable at September 30, 2017
23,798

 
 

 
 
 
 

                   
(a) 
Summary of Activity Relating to Restricted Units
Restricted Units are not included in issued and outstanding common stock until the shares are vested and released. The table below summarizes activity relating to Restricted Units:
 
Number of Shares
Underlying
Restricted Units —
Performance-Based Awards
 
Number of Shares
Underlying
Restricted Units —
Time-Based
Awards
Outstanding at September 30, 2016
4,224,488

 
5,884,023

Granted
3,224,696

 
8,457,761

Earned/released
(1,790,514
)
 
(7,150,783
)
Forfeited
(614,739
)
 
(713,837
)
Outstanding at September 30, 2017
5,043,931

 
6,477,164

Granted
2,175,537

 
8,876,712

Earned/released
(2,092,862
)
 
(7,156,468
)
Forfeited
(2,087,038
)
 
(1,325,321
)
Outstanding at September 30, 2018
3,039,568

 
6,872,087

Granted
1,342,836

 
9,500,077

Earned/released
(1,405,485
)
 
(6,383,908
)
Modification(a)
(296,759
)
 
296,759

Forfeited
(688,835
)
 
(1,286,071
)
Outstanding at September 30, 2019
1,991,325

 
8,998,944

Weighted average remaining recognition period of outstanding Restricted Units
1.4 years

 
1.9 years

Unrecognized stock-based compensation expense of outstanding Restricted Units
$24.5 million
 
$84.0 million
Aggregate intrinsic value of outstanding Restricted Units(b)
$32.5 million
 
$146.9 million
                       
(a) 296,759 shares of performance-based awards were modified to time-based awards with only service conditions in December 2018.
(b) The aggregate intrinsic value represents any excess of the closing price of our common stock of $16.31 on September 30, 2019 over the exercise price of the underlying Restricted Units
Summary of Weighted-Average Grant-Date Fair Value, Shares Issued and Total Stock-Based Compensation Expense Recognized Related to the Plan A summary of the weighted-average grant-date fair value, shares issued and total stock-based compensation expense recognized related to the Plan are as follows:
 
2019
 
2018
 
2017
Weighted-average grant-date fair value per share
$
3.76

 
$
4.00

 
$
3.84

Total shares issued (in millions)
1.2

 
1.3

 
1.3

Total stock-based compensation expense (in millions)
$
4.5

 
$
5.2

 
$
4.9
Employee Stock Option [Member]  
Summary of Weighted-Average Grant-Date Fair Value of Stock Options Granted and Intrinsic Value of Stock Options Exercised A summary of intrinsic value of stock options exercised is as follows:
 
2019
 
2018
 
2017
Total intrinsic value of stock options exercised (in millions)
$
0.1

 
$
0.1

 
$
3.6
Restricted Stock Units  
Summary of Weighted-Average Grant-Date Fair Value and Intrinsic Value of Restricted Units Vested
(b) The aggregate intrinsic value represents any excess of the closing price of our common stock of $16.31 on September 30, 2019 over the exercise price of the underlying Restricted Units.
A summary of
Restricted Stock  
Summary of Activity Relating to Restricted Units The table below summarizes activities related to Restricted Stock:
 
Number of
Shares
Underlying
Restricted Stock
 
Weighted
Average Grant
Date Fair
Value
Outstanding at September 30, 2016
—

 
—

Granted
250,000

 
$
15.55

Vested
(250,000
)
 
$
15.55

Outstanding at September 30, 2017
—

 
—

Outstanding at September 30, 2018
—

 
—

Outstanding at September 30, 2019
—

 
—
1995 Employee Stock Purchase Plan  
Weighted Average Assumptions Used to Estimate Fair Value of Purchase Rights Granted
The fair value of the purchase rights granted under this plan was estimated on the date of grant using the Black-Scholes option-pricing model that uses the following weighted-average assumptions, which were derived in a manner similar to those discussed above relative to stock options:
 
2019
 
2018
 
2017
Dividend yield
0.0
%
 
0.0
%
 
0.0
%
Expected volatility
27.8
%
 
32.1
%
 
29.3
%
Risk-free interest rate
2.2
%
 
2.0
%
 
0.9
%
Expected term (in years)
0.5

 
0.5

 
0.5