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Stock-based Compensation (Tables)
 12 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions Used in Black-Scholes Option Valuation Model
The fair value of each option is estimated on the date of grant using a Black-Scholes option valuation model that uses the assumptions noted in the following table. Expected volatilities are based on the historical volatility of the Company’s stock and other factors. The Company uses historical data to estimate option exercises and employee terminations within the valuation model. The expected term of options represents the period of time that options granted are expected to be outstanding. The risk-free rate for periods during the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.
 
Year Ended September 30,
 
2016
 
2015
 
2014
Expected life of option (years)
6.4
 
6.6
 
6.7
Risk-free interest rate
1.64% - 1.70%
 
1.61% - 1.93%
 
1.92%
Expected volatility of the Company’s stock
36.00%
 
36.00%
 
36.00%
Expected dividend yield on the Company’s stock
2.11%
 
2.02%
 
2.17%
Summary of Stock Option Activity
A summary of stock option activity at September 30, 2016, 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, 2015
$
31.17

 
13,039,240

 
 
 
 
Granted
43.83

 
961,705

 
 
 
 
Exercised
27.92

 
(2,380,398
)
 
 
 
 
Forfeited or expired
42.90

 
(170,390
)
 
 
 
 
Outstanding, September 30, 2016
$
32.74

 
11,450,157

 
4.9
 
$
162

Exercisable, September 30, 2016
$
30.06

 
9,623,505

 
4.3
 
$
159
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, 2016 were as follows:
Expected life of SAR (years)
0.5 - 4.2
Risk-free interest rate
0.45% - 1.04%
Expected volatility of the Company’s stock
36.00%
Expected dividend yield on the Company’s stock
2.11%
Summary of Stock Appreciation Rights Activity
A summary of SAR activity at September 30, 2016, 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, 2015
$
29.53

 
1,740,100

 
 
 
 
Granted
43.86

 
54,749

 
 
 
 
Exercised
27.41

 
(494,480
)
 
 
 
 
Forfeited or expired
36.33

 
(99,204
)
 
 
 
 
Outstanding, September 30, 2016
$
30.49

 
1,201,165

 
4.6
 
$
19

Exercisable, September 30, 2016
$
29.23

 
1,114,543

 
4.3
 
$
19
Summary of Nonvested Restricted Stock Awards
A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2016, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
Restriction
Nonvested, September 30, 2015
$
45.75

 
2,370,155

Granted
45.24

 
3,666,989

Converted performance share awards *
49.20

 
1,108,036

Vested
30.78

 
(413,050
)
Forfeited
45.82

 
(352,949
)
Nonvested, September 30, 2016
$
47.02

 
6,379,181
Summary of Nonvested PSUs
A summary of the status of the Company’s nonvested PSUs at September 30, 2016, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
PSU
Nonvested, September 30, 2015
$
42.33

 
924,388

Vested
30.73

 
(344,318
)
Forfeited
49.73

 
(21,305
)
Nonvested, September 02, 2016
$
49.20

 
558,765

Conversion to nonvested restricted stock *
49.20

 
(558,765
)
Nonvested, September 30, 2016
$
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