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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
We estimated the fair value of each stock option on the date of grant using the Black-Scholes pricing model and the following assumptions:
 
 
2015
 
2014
 
2013
Average risk-free interest rate
 
1.61
%
 
1.52
%
 
0.66
%
Expected dividend yield
 
2.25
%
 
2.13
%
 
2.35
%
Expected volatility
 
31
%
 
41
%
 
43
%
Expected term (years)
 
5.1

 
5.2

 
5.3
Schedule of Share-Based Compensation, Stock Options, Activity
A summary of stock option activity for the year ended September 30, 2015 is:
 
 
Shares
(in thousands)
 
Wtd. Avg.
Exercise
Price
 
Wtd. Avg.
Remaining
Contractual
Term (years)
 
Aggregate
Intrinsic Value
of In-The-Money
Options
(in millions)
Outstanding at October 1, 2014
 
4,523

 
$
75.65

 
 
 
 
Granted
 
1,041

 
115.62

 
 
 
 
Exercised
 
(897
)
 
67.18

 
 
 
 
Forfeited
 
(90
)
 
105.58

 
 
 
 
Cancelled
 
(3
)
 
84.75

 
 
 
 
Outstanding at September 30, 2015
 
4,574

 
85.81

 
6.8
 
$
92.1

Vested or expected to vest at September 30, 2015
 
4,397

 
84.94

 
6.8
 
91.5

Exercisable at September 30, 2015
 
2,665

 
70.23

 
5.6
 
85.2
Schedule of Nonvested Performance Units Activity
A summary of performance share activity for the year ended September 30, 2015 is as follows:
 
 
Performance
Shares
(in thousands)
 
Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2014
 
224

 
$
102.54

Granted(1)
 
87

 
103.70

Adjustment for performance results achieved(2)
 
71

 
101.57

Vested and issued
 
(154
)
 
101.57

Forfeited
 
(2
)
 
103.56

Outstanding at September 30, 2015
 
226

 
103.33
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest
The following table summarizes information about performance shares vested during the years ended September 30, 2015, 2014 and 2013:
 
 
2015
 
2014
 
2013
Percent payout
 
187
%
 
180
%
 
173
%
Shares vested (in thousands)
 
154

 
127

 
232

Total fair value of shares vested (in millions)
 
$
17.2

 
$
14.2

 
$
18.7
Schedule of Share-Based Payment Award, Performance-Based Units, Valuation Assumptions
The per-share fair value of performance share awards granted during the years ended September 30, 2015, 2014 and 2013 was $103.70, $108.48 and $98.15, respectively, which we determined using a Monte Carlo simulation and the following assumptions:
 
 
2015
 
2014
 
2013
Average risk-free interest rate
 
0.96
%
 
0.60
%
 
0.32
%
Expected dividend yield
 
2.22
%
 
2.11
%
 
2.32
%
Expected volatility
 
24
%
 
33
%
 
36
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of restricted stock and restricted stock unit activity for the year ended September 30, 2015 is as follows:
 
 
Restricted
Stock and
Restricted
Stock Units
(in thousands)
 
Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2014
 
190

 
$
84.57

Granted
 
52

 
115.02

Vested
 
(71
)
 
73.79

Forfeited
 
(8
)
 
100.61

Outstanding at September 30, 2015
 
163

 
98.22