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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Weighted Average Assumptions for all Options Granted Estimated at Grant Date Using Black-Scholes-Merton Option-Pricing Model | The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:
| Fiscal Years Ended September 30,
| 2025 |  | 2024 |  | 2023
Risk-free interest rate | 4.0% to 4.5% |  | 4.1% to 4.7% |  | 3.5% to 4.2%
Expected life of options | 6.5 years |  | 6.5 years |  | 6.5 years
Expected dividend yield of stock | — |  | — |  | —
Expected volatility of stock | 32.5% |  | 33.5% |  | 32.5%
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity | The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2025:
| Number of Options |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at September 30, 2024 | 561,109 |  |  | $ | 795.95 |  |  |  |  |
Granted | 346,664 |  |  | 1,316.43 |  |  |  |  |
Exercised | (26,420) |  |  | 656.47 |  |  |  |  |
Forfeited | (121,745) |  |  | 909.08 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2025 | 759,608 |  |  | $ | 1,020.20 |  |  | 8.4 years |  | $ | 226,226,455 |
Expected to vest | 409,971 |  |  | $ | 1,051.67 |  |  | 8.5 years |  | $ | 109,195,776 |
Exercisable at September 30, 2025 | 93,696 |  |  | $ | 724.47 |  |  | 7.6 years |  | $ | 55,613,261 |
The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2025:
| Number of Options |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at September 30, 2024 | 3,779,503 |  |  | $ | 466.18 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (462,368) |  |  | 288.80 |  |  |  |  |
Forfeited | (86,209) |  |  | 620.43 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2025 | 3,230,926 |  |  | $ | 487.45 |  |  | 4.4 years |  | $ | 2,683,510,208 |
Expected to vest | 478,730 |  |  | $ | 670.73 |  |  | 7.1 years |  | $ | 309,877,142 |
Exercisable at September 30, 2025 | 2,429,832 |  |  | $ | 376.64 |  |  | 3.6 years |  | $ | 2,287,395,248 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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