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Stockholders' Equity (Tables)
 9 Months Ended
Jun. 30, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Summary of Activity in Common Stock and Treasury Stock Shares

Activity in common stock and treasury stock shares were as follows:

 

 

Common Stock

 

 

Treasury Stock

 

 

Treasury stock held for deferred compensation

 

Balances as of April 1, 2024

 

 

72,960

 

 

 

(12,185

)

 

 

(53

)

Purchase of treasury stock

 

 

—

 

 

 

(1,692

)

 

 

—

 

Sales of treasury stock

 

 

—

 

 

 

606

 

 

 

—

 

Common shares issued for benefit plans

 

 

—

 

 

 

21

 

 

 

—

 

Distribution of stock from deferred compensation

 

 

—

 

 

 

—

 

 

 

1

 

Balances as of June 30, 2024

 

 

72,960

 

 

 

(13,250

)

 

 

(52

)

 

 

 

 

 

 

 

 

 

 

Balances as of April 1, 2025

 

 

72,960

 

 

 

(13,380

)

 

 

(30

)

Purchase of treasury stock

 

 

—

 

 

 

(231

)

 

 

—

 

Sales of treasury stock

 

 

—

 

 

 

626

 

 

 

—

 

Common shares issued for benefit plans

 

 

—

 

 

 

—

 

 

 

—

 

Distribution of stock from deferred compensation

 

 

—

 

 

 

—

 

 

 

1

 

Balances as of June 30, 2025

 

 

72,960

 

 

 

(12,985

)

 

 

(29

)

 

 

 

 

Common Stock

 

 

Treasury Stock

 

 

Treasury stock held for deferred compensation

 

Balances as of September 30, 2023

 

 

72,960

 

 

 

(13,070

)

 

 

(55

)

Purchase of treasury stock

 

 

—

 

 

 

(1,692

)

 

 

—

 

Sales of treasury stock

 

 

—

 

 

 

1,332

 

 

 

—

 

Common shares issued for benefit plans

 

 

—

 

 

 

180

 

 

 

—

 

Purchases of stock by deferred compensation

 

 

—

 

 

 

—

 

 

 

(1

)

Distribution of stock from deferred compensation

 

 

—

 

 

 

—

 

 

 

4

 

Balances as of June 30, 2024

 

 

72,960

 

 

 

(13,250

)

 

 

(52

)

 

 

 

 

 

 

 

 

 

Balances as of September 30, 2024

 

 

72,960

 

 

 

(13,787

)

 

 

(45

)

Purchase of treasury stock

 

 

—

 

 

 

(680

)

 

 

—

 

Sales of treasury stock

 

 

—

 

 

 

1,351

 

 

 

—

 

Common shares issued for benefit plans

 

 

—

 

 

 

131

 

 

 

—

 

Purchases of stock by deferred compensation

 

 

—

 

 

 

—

 

 

 

(1

)

Distribution of stock from deferred compensation

 

 

—

 

 

 

—

 

 

 

17

 

Balances as of June 30, 2025

 

 

72,960

 

 

 

(12,985

)

 

 

(29

)
Summary of Activity for RSUs

A summary of the activity for RSUs:

 

 

Three Months Ended June 30, 2025

 

 

Nine Months Ended June 30, 2025

 

 

 

Number of units

 

 

Weighted-Average Grant Date Fair Value

 

 

Number of units

 

 

Weighted-Average Grant Date Fair Value

 

Beginning balance

 

 

350

 

 

$

140.11

 

 

 

318

 

 

$

118.19

 

Granted

 

 

4

 

 

 

201.47

 

 

 

117

 

 

 

191.45

 

Released

 

 

(43

)

 

 

100.50

 

 

 

(120

)

 

 

116.41

 

Forfeited

 

 

(4

)

 

 

162.28

 

 

 

(8

)

 

 

145.26

 

Ending balance

 

 

307

 

 

$

146.22

 

 

 

307

 

 

$

146.22

 

 
Stock Options [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Summary of Activity for Stock Option Awards

The following is a summary of the activity for stock option awards:

 

 

Three Months Ended June 30, 2025

 

 

Nine Months Ended June 30, 2025

 

 

 

Number of options

 

 

Weighted-Average Exercise Price per Share

 

 

Number of options

 

 

Weighted-Average Exercise Price per Share

 

Beginning balance

 

 

2,956

 

 

$

89.20

 

 

 

3,578

 

 

$

86.03

 

Granted

 

 

—

 

 

 

—

 

 

 

41

 

 

 

191.45

 

Exercised

 

 

(598

)

 

 

82.93

 

 

 

(1,257

)

 

 

80.46

 

Forfeited

 

 

(2

)

 

 

92.88

 

 

 

(6

)

 

 

102.20

 

Ending balance

 

 

2,356

 

 

$

90.78

 

 

 

2,356

 

 

$

90.78

 
Changes in Non-vested Stock Options

Changes in non-vested stock options were as follows:

 

 

Three Months Ended June 30, 2025

 

 

Nine Months Ended June 30, 2025

 

 

 

Number of options

 

 

Weighted-Average Grant Date Fair Value per Share

 

 

Number of options

 

 

Weighted-Average Grant Date Fair Value Per Share

 

Beginning balance

 

 

501

 

 

$

43.35

 

 

 

898

 

 

$

37.30

 

Granted

 

 

—

 

 

 

—

 

 

 

41

 

 

 

83.65

 

Vested

 

 

(19

)

 

 

39.51

 

 

 

(453

)

 

 

34.82

 

Forfeited

 

 

(2

)

 

 

35.64

 

 

 

(6

)

 

 

40.88

 

Ending balance

 

 

480

 

 

$

43.53

 

 

 

480

 

 

$

43.53

 
Stock Options Vested, or Expected to Vest and Exercisable

Information about stock options that have vested, or are expected to vest, and are exercisable at June 30, 2025 were as follows:

 

 

Number of options

 

 

Weighted-Average Exercise Price

 

 

Weighted-Average Remaining Life in Years

 

 

Aggregate Intrinsic Value

 

Options outstanding

 

 

2,356

 

 

$

90.78

 

 

 

5.2

 

 

$

363,525

 

Options vested and exercisable

 

 

1,876

 

 

 

86.27

 

 

 

4.6

 

 

 

297,983

 

Options vested and expected to vest

 

 

2,342

 

 

 

90.53

 

 

 

5.2

 

 

 

361,901

 
Performance Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Schedule of Assumptions to Value PSUs Granted

The fair value of the PSUs at the grant date was determined based upon a Monte Carlo valuation method. The assumptions used in the Monte Carlo method to value the PSUs granted, which includes the grant date fair value outcome from the Monte Carlo method, were as follows:

 

 

June 30, 2025

 

 

June 30, 2024

 

Expected volatility

 

 

30.9

%

 

 

30.2

%

Risk free interest rate

 

 

4.1

%

 

 

4.5

%

Expected life

 

3 years

 

 

3 years

 

Grant date fair value

 

$

196.63

 

 

$

146.47

 
Summary of Activity for PSUs

A summary of the activity for PSUs:

 

 

Three Months Ended June 30, 2025

 

 

Nine Months Ended June 30, 2025

 

 

 

Number of units

 

 

Weighted-Average Grant Date Fair Value

 

 

Number of units

 

 

Weighted-Average Grant Date Fair Value

 

Beginning balance

 

 

105

 

 

$

167.25

 

 

 

62

 

 

$

146.47

 

Granted

 

 

—

 

 

 

—

 

 

 

44

 

 

 

196.63

 

Forfeited

 

 

(1

)

 

 

174.04

 

 

 

(2

)

 

 

172.64

 

Ending balance

 

 

104

 

 

$

167.20

 

 

 

104

 

 

$

167.20