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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - Employee Stock Option - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Weighted- Average Exercise Price Per Share |  |  |
Beginning of year (in dollars per share) | $ 53.35 |  |
Granted (in dollars per share) | 0 | $ 0 | $ 0
Exercised (in dollars per share) | 54.76 |  |
Canceled/Forfeited (in dollars per share) | 62.47 |  |
End of year (in dollars per share) | 51.71 | $ 53.35 |
Exercisable at end of year(in dollars per share) | $ 51.71 |  |
Shares |  |  |
Beginning of year (in shares) | 589 |  |
Exercised (in shares) | (294) |  |
Canceled/Forfeited (in shares) | (7) |  |
End of year (in shares) | 288 | 589 |
Exercisable at end of year (in shares) | 289 |  |
Total Intrinsic Value of Shares |  |  |
Total intrinsic value of awards, at end of year | $ 16 |  |
Total intrinsic value of awards, exercisable at end of year | $ 16 |  |
Average Remaining Life (Years) |  |  |
Average remaining life, at end of year | 1 year 4 months 24 days |  |
Average remaining life, exercisable at year end | 1 year 4 months 24 days |  |
AspenTech |  |  |
Weighted- Average Exercise Price Per Share |  |  |
Beginning of year (in dollars per share) | $ 161.26 |  |
Granted (in dollars per share) | 0 |  |
Exercised (in dollars per share) | 104.86 |  |
Canceled/Forfeited (in dollars per share) | 118.38 |  |
End of year (in dollars per share) | 159.47 | $ 161.26 |
Exercisable at end of year(in dollars per share) | 133.36 |  |
Vested and expected to vest at end of year (in dollars per share) | $ 142.10 |  |
Shares |  |  |
Beginning of year (in shares) | 974 |  |
Granted (in shares) | 0 |  |
Exercised (in shares) | (217) |  |
Canceled/Forfeited (in shares) | (76) |  |
End of year (in shares) | 681 | 974 |
Exercisable at end of year (in shares) | 563 |  |
Vested and expected to vest at end of year (in shares) | 676 |  |
Total Intrinsic Value of Shares |  |  |
Total intrinsic value of awards, at end of year | $ 66 |  |
Total intrinsic value of awards, exercisable at end of year | 59 |  |
Total intrinsic value of awards, vested and expected to best at end of year | $ 65 |  |
Average Remaining Life (Years) |  |  |
Average remaining life, at end of year | 5 years 7 months 6 days |  |
Average remaining life, exercisable at year end | 5 years 2 months 12 days |  |
Average remaining life, vested and expected to vest at end of year | 5 years 7 months 6 days |  |

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