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Stock-Based Employee Benefit Plans - Summary of Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Shares |  |  |
Outstanding at September 30, 2022 (in shares) | 209 |  |
Granted (in shares) | 58 |  |
Exercised (in shares) | (38) |  |
Forfeited (in shares) | (2) |  |
Outstanding at September 30, 2023 (in shares) | 227 | 209 |
Options exercisable at September 30, 2023 (in shares) | 153 |  |
Vested and expected to vest at September 30, 2023 (in shares) | 221 |  |
Weighted- average Exercise Price |  |  |
Outstanding at September 30, 2022 (in dollars per share) | $ 247.56 |  |
Granted (in dollars per share) | 779.98 |  |
Exercised (in dollars per share) | 214.00 |  |
Forfeited (in dollars per share) | 390.14 |  |
Outstanding at September 30, 2023 (in dollars per share) | 387.95 | $ 247.56 |
Options exercisable at September 30, 2023 (in dollars per share) | 236.84 |  |
Vested and expected to vest at September 30, 2023 (in dollars per share) | $ 377.24 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 3 years 6 months 18 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term | 2 years 3 months 18 days |  |
Vested and expected to vest - Weighted average remaining term | 3 years 5 months 15 days |  |
Vested and expected to vest - Aggregate Intrinsic value | $ 108,544 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | 109,242 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ 96,648 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value of options granted (in dollars per share) | $ 289.54 | $ 134.91 | $ 139.11
Number of options that had exercise prices lower than the market price of common stock (in shares) | 227 |  |
Market price of common stock (in dollars per share) | $ 868.53 |  |
Total intrinsic value of options exercised | $ 16,700 | $ 14,500 | $ 15,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 227 | 209 |
Equity Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average expected term (years) | 5 years 2 months 23 days | 4 years 5 months 4 days | 4 years 5 months 19 days
Expected volatility (range), maximum | 35.50% | 34.10% | 34.40%
Weighted average volatility | 33.50% | 33.20% | 33.90%
Risk free interest rate, maximum | 4.49% | 2.85% | 0.73%
Average expected dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility (range), minimum | 33.40% | 32.90% | 33.60%
Risk free interest rate, minimum | 3.40% | 1.18% | 0.29%

X
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