Share-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [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:

	2023		2022		2021
Average risk-free interest rate	3.78	%	0.38 %		0.38 %
Expected dividend yield	1.82	%	1.28	%	1.73 %
Expected volatility	34	%	31 %		31 %
Expected term (years)	4.8		4.8		4.9

Schedule of Share-Based Compensation, Stock Options, Activity

A summary of stock option activity for the year ended September 30, 2023, is as follows:

	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, 2022	2,246	$	186.72
Granted	233	259.82
Exercised	(539)	165.34
Forfeited	(14)	282.78
Canceled	(2)	350.76
Outstanding at September 30, 2023	1,924	200.03		5.6	$	172.9
Exercisable at September 30, 2023	1,554	180.80		4.9	165.4

Schedule of Nonvested Performance-based Units Activity

A summary of performance share activity for the year ended September 30, 2023, is as follows:

	Shares (in thousands)	Wtd. Avg. Grant Date Share Fair Value
Outstanding at October 1, 2022	97	$	354.29
Granted (1)	66	340.77
Adjustment for performance results achieved (2)	22	265.04
Vested and issued	(48)	265.04
Forfeited	(6)	381.85
Outstanding at September 30, 2023	131	364.57

(1) Performance shares granted assuming achievement of performance goals at target.

(2) Adjustments were due to the number of shares vested under fiscal 2020 awards at the end of the three-year performance period ended September 30, 2022, being higher than the target number of shares.

Schedule of Performance Shares Vested

The following table summarizes information about performance shares vested during the years ended September 30, 2023, 2022, and 2021:

	2023			2022			2021
Percent payout	177		%	144		%	93		%
Shares vested (in thousands)	48			68			31
Total fair value of shares vested (in millions)	$	12.5		$	23.4		$	7.4

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, 2023, 2022, and 2021, was $340.77, $481.28, and $298.10, respectively, which we determined using a Monte Carlo simulation and the following assumptions:

	2023		2022		2021
Average risk-free interest rate	4.08	%	0.94	%	0.19	%
Expected dividend yield	1.82	%	1.28	%	1.73 %
Expected volatility	39	%	36	%	37	%

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, 2023, is as follows:

	Shares (in thousands)	Wtd. Avg. Grant Date Share Fair Value
Outstanding at October 1, 2022	448	$	271.71
Granted	245	263.67
Vested	(198)	256.98
Forfeited	(28)	279.30
Outstanding at September 30, 2023	467	273.28