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Stock-based Compensation (Tables)
 12 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2013
Expected life of option (years)
6.6
 
6.7
 
5.0 - 6.7
Risk-free interest rate
1.61% - 1.93%
 
1.92%
 
0.62% - 1.33%
Expected volatility of the Company’s stock
36.00%
 
36.00%
 
41.00%
Expected dividend yield on the Company’s stock
2.02%
 
2.17%
 
2.03%
Summary of Stock Option Activity
A summary of stock option activity at September 30, 2015, 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, 2014
$
28.83

 
22,727,917

 
 
 
 
Granted
50.16

 
794,978

 
 
 
 
Exercised
27.28

 
(10,154,810
)
 
 
 
 
Forfeited or expired
35.70

 
(328,845
)
 
 
 
 
Outstanding, September 30, 2015
$
31.17

 
13,039,240

 
5.3
 
$
144

Exercisable, September 30, 2015
$
29.41

 
10,095,826

 
4.6
 
$
123
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, 2015 were as follows:
Expected life of SAR (years)
0.05 - 5.55
Risk-free interest rate
0.00% - 1.47%
Expected volatility of the Company’s stock
36.00%
Expected dividend yield on the Company’s stock
2.02%
Summary of Stock Appreciation Rights Activity
A summary of SAR activity at September 30, 2015, 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, 2014
$
27.78

 
2,643,647

 
 
 
 
Granted
50.23

 
37,965

 
 
 
 
Exercised
27.85

 
(886,827
)
 
 
 
 
Forfeited or expired
28.66

 
(54,685
)
 
 
 
 
Outstanding, September 30, 2015
$
29.53

 
1,740,100

 
5.1
 
$
21

Exercisable, September 30, 2015
$
28.82

 
1,346,610

 
4.5
 
$
17
Summary of Nonvested Restricted Stock Awards
A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2015, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
Restriction
Nonvested, September 30, 2014
$
40.52

 
1,953,816

Granted
50.15

 
1,226,568

Vested
37.19

 
(597,440
)
Forfeited
47.15

 
(212,789
)
Nonvested, September 30, 2015
$
45.75

 
2,370,155
Summary of Nonvested PSUs
A summary of the status of the Company’s nonvested PSUs at September 30, 2015, and changes for the fiscal year then ended, is presented below:
 
Weighted
Average
Price
 
Shares/Units
Subject to
PSU
Nonvested, September 30, 2014
$
38.26

 
695,792

Granted
49.89

 
362,374

Forfeited
41.60

 
(133,778
)
Nonvested, September 30, 2015
$
42.33

 
924,388