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v3.26.1

Stockholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2026
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 was as follows:
|  | Common Stock |  |  | Treasury Stock |  |  | Treasury stock held for deferred compensation |
Balances as of January 1, 2025 |  |  | 72,960 |  |  |  | (13,607 | ) |  |  | (31 | )
Purchase of treasury stock |  |  | — |  |  |  | (243 | ) |  |  | — |
Sales of treasury stock |  |  | — |  |  |  | 344 |  |  |  | — |
Common shares issued for benefit plans |  |  | — |  |  |  | 126 |  |  |  | — |
Distribution of stock from deferred compensation |  |  | — |  |  |  | — |  |  |  | 1 |
Balances as of March 31, 2025 |  |  | 72,960 |  |  |  | (13,380 | ) |  |  | (30 | )
Balances as of January 1, 2026 |  |  | 72,960 |  |  |  | (13,174 | ) |  |  | (28 | )
Purchase of treasury stock |  |  | — |  |  |  | (631 | ) |  |  | — |
Sales of treasury stock |  |  | — |  |  |  | 360 |  |  |  | — |
Common shares issued for benefit plans |  |  | — |  |  |  | 78 |  |  |  | — |
Distribution of stock from deferred compensation |  |  | — |  |  |  | — |  |  |  | 1 |
Balances as of March 31, 2026 |  |  | 72,960 |  |  |  | (13,367 | ) |  |  | (27 | )
|  | Common Stock |  |  | Treasury Stock |  |  | Treasury stock held for deferred compensation |
Balances as of September 30, 2024 |  |  | 72,960 |  |  |  | (13,787 | ) |  |  | (45 | )
Purchase of treasury stock |  |  | — |  |  |  | (449 | ) |  |  | — |
Sales of treasury stock |  |  | — |  |  |  | 725 |  |  |  | — |
Common shares issued for benefit plans |  |  | — |  |  |  | 131 |  |  |  | — |
Purchases of stock by deferred compensation |  |  | — |  |  |  | — |  |  |  | (1 | )
Distribution of stock from deferred compensation |  |  | — |  |  |  | — |  |  |  | 16 |
Balances as of March 31, 2025 |  |  | 72,960 |  |  |  | (13,380 | ) |  |  | (30 | )
Balances as of September 30, 2025 |  |  | 72,960 |  |  |  | (13,060 | ) |  |  | (28 | )
Purchase of treasury stock |  |  | — |  |  |  | (1,086 | ) |  |  | — |
Sales of treasury stock |  |  | — |  |  |  | 701 |  |  |  | — |
Common shares issued for benefit plans |  |  | — |  |  |  | 78 |  |  |  | — |
Purchases of stock by deferred compensation |  |  | — |  |  |  | — |  |  |  | (1 | )
Distribution of stock from deferred compensation |  |  | — |  |  |  | — |  |  |  | 2 |
Balances as of March 31, 2026 |  |  | 72,960 |  |  |  | (13,367 | ) |  |  | (27 | )
Summary of Activity for RSUs | A summary of the activity for RSUs:
|  | Three Months Ended March 31, 2026 |  |  | Six Months Ended March 31, 2026 |
|  | Number of units |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of units |  |  | Weighted-Average Grant Date Fair Value |
Beginning balance |  |  | 264 |  |  | $ | 159.51 |  |  |  | 309 |  |  | $ | 148.31 |
Granted |  |  | 55 |  |  |  | 391.53 |  |  |  | 62 |  |  |  | 378.10 |
Released |  |  | (82 | ) |  |  | 159.64 |  |  |  | (132 | ) |  |  | 139.31 |
Forfeited |  |  | (1 | ) |  |  | 188.05 |  |  |  | (3 | ) |  |  | 131.21 |
Ending balance |  |  | 236 |  |  | $ | 213.07 |  |  |  | 236 |  |  | $ | 213.07 |
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 March 31, 2026 |  |  | Six Months Ended March 31, 2026 |
|  | Number of options |  |  | Weighted-Average Exercise Price per Share |  |  | Number of options |  |  | Weighted-Average Exercise Price per Share |
Beginning balance |  |  | 1,942 |  |  | $ | 92.48 |  |  |  | 2,249 |  |  | $ | 91.25 |
Granted |  |  | 17 |  |  |  | 391.53 |  |  |  | 17 |  |  |  | 391.53 |
Exercised |  |  | (287 | ) |  |  | 81.78 |  |  |  | (594 | ) |  |  | 82.65 |
Forfeited |  |  | (1 | ) |  |  | 83.24 |  |  |  | (1 | ) |  |  | 83.24 |
Ending balance |  |  | 1,671 |  |  | $ | 97.33 |  |  |  | 1,671 |  |  | $ | 97.33 |
Changes in Non-vested Stock Options | Changes in non-vested stock options were as follows:
|  | Three Months Ended March 31, 2026 |  |  | Six Months Ended March 31, 2026 |
|  | Number of options |  |  | Weighted-Average Grant Date Fair Value per Share |  |  | Number of options |  |  | Weighted-Average Grant Date Fair Value Per Share |
Beginning balance |  |  | 247 |  |  | $ | 48.33 |  |  |  | 473 |  |  | $ | 43.40 |
Granted |  |  | 17 |  |  |  | 173.79 |  |  |  | 17 |  |  |  | 173.79 |
Vested |  |  | (31 | ) |  |  | 64.60 |  |  |  | (257 | ) |  |  | 41.21 |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Ending balance |  |  | 233 |  |  | $ | 55.26 |  |  |  | 233 |  |  | $ | 55.26 |
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 March 31, 2026 was as follows:
|  | Number of options |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Life in Years |  |  | Aggregate Intrinsic Value |
Options outstanding |  |  | 1,671 |  |  | $ | 97.33 |  |  |  | 4.8 |  |  | $ | 436,191 |
Options vested and exercisable |  |  | 1,439 |  |  |  | 91.91 |  |  |  | 4.4 |  |  |  | 382,708 |
Options vested and expected to vest |  |  | 1,663 |  |  |  | 96.84 |  |  |  | 4.8 |  |  |  | 434,762 |
Performance Restricted Stock Units [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Assumptions to Value PSUs Granted |
|  | March 31, 2026 |  |  | March 31, 2025 |  |  | March 31, 2024 |
Expected volatility |  |  | 30.7 | % |  |  | 30.9 | % |  |  | 30.2 | %
Risk free interest rate |  |  | 3.4 | % |  |  | 4.1 | % |  |  | 4.5 | %
Expected life |  | 3 years |  |  | 3 years |  |  | 3 years |
Grant date fair value |  | $ | 367.56 |  |  | $ | 196.63 |  |  | $ | 146.47 |
Market condition awards [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of the Activity Awards | A summary of the activity for market condition awards:
|  | Six Months Ended March 31, 2026 |
|  | Number of units |  |  | Weighted-Average Grant Date Fair Value |
Beginning balance |  |  | 104 |  |  | $ | 167.17 |
Granted |  |  | 15 |  |  |  | 367.56 |
Forfeited |  |  | — |  |  |  | — |
Ending balance |  |  | 119 |  |  | $ | 193.29 |
There was no activity for market condition awards during the three months ended March 31, 2026.
Performance Condition Award [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of the Activity Awards | A summary of the activity for performance condition awards:
|  | Six Months Ended March 31, 2026 |
|  | Number of units |  |  | Weighted-Average Grant Date Fair Value |
Beginning balance |  |  | — |  |  | $ | — |
Granted |  |  | 15 |  |  |  | 298.15 |
Forfeited |  |  | — |  |  |  | — |
Ending balance |  |  | 15 |  |  | $ | 298.15 |
There was no activity for performance condition awards during the three months ended March 31, 2026.

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Data Type: | na
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