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Stock-Based Compensation stock-based compensation performance based on the market return (Details)
 12 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Expected volatility 27.30%
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)