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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2017
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:
 
 
2017
 
2016
 
2015
Average risk-free interest rate
 
1.85
%
 
1.76
%
 
1.61
%
Expected dividend yield
 
2.21
%
 
2.78
%
 
2.25
%
Expected volatility
 
24
%
 
29
%
 
31
%
Expected term (years)
 
5.1

 
5.1

 
5.1
Schedule of Share-Based Compensation, Stock Options, Activity
A summary of stock option activity for the year ended September 30, 2017 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, 2016
 
5,098

 
$
90.96

 
 
 
 
Granted
 
1,024

 
138.09

 
 
 
 
Exercised
 
(2,168
)
 
81.70

 
 
 
 
Forfeited
 
(59
)
 
122.45

 
 
 
 
Canceled
 
(6
)
 
65.54

 
 
 
 
Outstanding at September 30, 2017
 
3,889

 
108.10

 
7.2
 
$
272.6

Vested or expected to vest at September 30, 2017
 
2,642

 
92.07

 
5.7
 
227.6

Exercisable at September 30, 2017
 
1,847

 
92.14

 
5.6
 
158.9
Schedule of Nonvested Performance Units Activity
A summary of performance share activity for the year ended September 30, 2017 is as follows:
 
 
Performance
Shares
(in thousands)
 
Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2016
 
240

 
$
98.73

Granted(1)
 
42

 
174.37

Adjustment for performance results achieved(2)
 
(58
)
 
108.48

Vested and issued
 
(6
)
 
108.48

Forfeited
 
(28
)
 
94.41

Outstanding at September 30, 2017
 
190

 
112.64


(1)
Performance shares granted assuming achievement of performance goals at target.
(2)
Adjustments were due to the number of shares vested under the fiscal 2014 awards at the end of the three-year performance period ended September 30, 2016 being lower than the target number of shares.
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, 2017, 2016 and 2015:
 
 
2017
 
2016
 
2015
Percent payout
 
10
%
 
93
%
 
187
%
Shares vested (in thousands)
 
6

 
67

 
154

Total fair value of shares vested (in millions)
 
$
0.9

 
$
7.1

 
$
17.2
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, 2017, 2016 and 2015 was $174.37, $87.64 and $103.70, respectively, which we determined using a Monte Carlo simulation and the following assumptions:
 
 
2017
 
2016
 
2015
Average risk-free interest rate
 
1.35
%
 
1.21
%
 
0.96
%
Expected dividend yield
 
2.20
%
 
2.75
%
 
2.22
%
Expected volatility
 
23
%
 
22
%
 
24
%
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, 2017 is as follows:
 
 
Restricted
Stock and
Restricted
Stock Units
(in thousands)
 
Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2016
 
156

 
$
108.63

Granted
 
52

 
138.32

Vested
 
(54
)
 
109.82

Forfeited
 
(13
)
 
110.51

Outstanding at September 30, 2017
 
141

 
118.87