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Stock-based Compensation (Tables)
12 Months Ended
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used in Black-Scholes Option Valuation Model
 
Year Ended September 30,
 
2019
 
2018
 
2017
Expected life of option (years)
6.4
 
6.5
 
4.75 & 6.5
Risk-free interest rate
2.77%
 
2.28%
 
1.23% - 1.93%
Expected volatility of the Company’s stock
21.80%
 
23.70%
 
24.60%
Expected dividend yield on the Company’s stock
3.29%
 
2.78%
 
2.21%


Summary of Stock Option Activity
A summary of stock option activity at September 30, 2019, and changes for the year then ended, is presented below:
 
Weighted
Average
Option Price
 
Shares
Subject to
Option
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding, September 30, 2018
$
34.24

 
17,836,062

 
 
 
 
Granted
33.37

 
1,741,510

 

 
 
Exercised
27.54

 
(6,234,755
)
 
 
 
 
Forfeited or expired
37.49

 
(973,068
)
 
 
 
 
Outstanding, September 30, 2019
$
35.07

 
12,369,749

 
4.6
 
$
111

Exercisable, September 30, 2019
$
34.74

 
9,295,813

 
3.4
 
$
87


Assumptions Used in Black-Scholes Stock Appreciation Rights Valuation Model
The assumptions used to determine the fair value of the SAR awards at September 30, 2019 were as follows:
Expected life of SAR (years)
0.4 - 3.5
Risk-free interest rate
1.55% - 1.85%
Expected volatility of the Company’s stock
21.80%
Expected dividend yield on the Company’s stock
3.29%

Summary of Stock Appreciation Rights Activity
A summary of SAR activity at September 30, 2019, and changes for the year then ended, is presented below:
 
Weighted
Average
SAR Price
 
Shares
Subject to
SAR
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding, September 30, 2018
$
27.39

 
626,701

 
 
 
 
Exercised
25.20

 
(245,513
)
 
 
 
 
Forfeited or expired
32.43

 
(13,179
)
 
 
 
 
Outstanding, September 30, 2019
$
28.67

 
368,009

 
2.4
 
$
6

Exercisable, September 30, 2019
$
28.59

 
365,829

 
2.4
 
$
6



Summary of Nonvested Restricted Stock Awards
A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2019, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
Restriction
Nonvested, September 30, 2018
$
45.14

 
5,001,517

Granted
33.88

 
2,384,747

Vested
41.23

 
(3,139,142
)
Forfeited
37.83

 
(914,046
)
Nonvested, September 30, 2019
$
35.98

 
3,333,076


Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 
Year Ended September 30,
 
2019
 
2018
 
2017
Risk-free interest rate
2.76%
 
1.92%
 
1.40%
Expected volatility of the Company’s stock
22.90%
 
21.70%
 
21.00%


Summary of Nonvested PSUs
A summary of the status of the Company’s nonvested PSUs at September 30, 2019, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
PSU
Nonvested, September 30, 2018
$
41.07

 
1,412,290

Granted
36.28

 
595,594

Forfeited
37.89

 
(182,365
)
Nonvested, September 30, 2019
$
39.82

 
1,825,519