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Stock-based Compensation (Tables)
12 Months Ended
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used in Black-Scholes Option Valuation Model
 
Year Ended September 30,
 
2018
 
2017
 
2016
Expected life of option (years)
6.5
 
4.75 & 6.5
 
6.4
Risk-free interest rate
2.28%
 
1.23% - 1.93%
 
1.64% - 1.70%
Expected volatility of the Company’s stock
23.70%
 
24.60%
 
36.00%
Expected dividend yield on the Company’s stock
2.78%
 
2.21%
 
2.11%
Summary of Stock Option Activity
A summary of stock option activity at September 30, 2018, 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, 2017
$
32.76

 
19,730,443

 
 
 
 
Granted
37.32

 
1,376,807

 

 
 
Exercised
24.24

 
(2,733,159
)
 
 
 
 
Forfeited or expired
38.62

 
(538,029
)
 
 
 
 
Outstanding, September 30, 2018
$
34.24

 
17,836,062

 
4.2
 
$
84

Exercisable, September 30, 2018
$
31.22

 
14,329,210

 
3.3
 
$
84

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, 2018 were as follows:
Expected life of SAR (years)
0.4 - 5.1
Risk-free interest rate
2.29% - 2.94%
Expected volatility of the Company’s stock
23.70%
Expected dividend yield on the Company’s stock
2.78%
Summary of Stock Appreciation Rights Activity
A summary of SAR activity at September 30, 2018, 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, 2017
$
27.02

 
893,311

 
 
 
 
Granted
25.78

 
12,119

 
 
 
 
Exercised
26.13

 
(256,900
)
 
 
 
 
Forfeited or expired
26.09

 
(21,829
)
 
 
 
 
Outstanding, September 30, 2018
$
27.39

 
626,701

 
3.2
 
$
5

Exercisable, September 30, 2018
$
26.52

 
590,556

 
3.1
 
$
5

Summary of Nonvested Restricted Stock Awards
A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2018, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
Restriction
Nonvested, September 30, 2017
$
44.48

 
6,961,706

Granted
37.21

 
2,274,160

Vested
39.84

 
(3,819,581
)
Forfeited
39.38

 
(414,768
)
Nonvested, September 30, 2018
$
45.14

 
5,001,517

Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]
 
Year Ended September 30,
 
2018
 
2017
Risk-free interest rate
1.92%
 
1.40%
Expected volatility of the Company’s stock
21.70%
 
21.00%
Summary of Nonvested PSUs
A summary of the status of the Company’s nonvested PSUs at September 30, 2018, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
PSU
Nonvested, September 30, 2017
$
43.24

 
1,119,388

Granted
37.36

 
496,478

Forfeited
43.97

 
(203,576
)
Nonvested, September 30, 2018
$
41.07

 
1,412,290