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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |
Unrecognized compensation cost related to non-vested awards granted | $ 119 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 1 year 1 month 6 days |  |
Common stock, capital shares reserved for future issuance (in shares) | 8,800,000 |  |
AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received for option exercises | $ 29 |  |
Common stock, capital shares reserved for future issuance (in shares) | 3,700,000 |  |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |
Percentage of options granted at the closing market price of common stock on the grant date | 100.00% |  |
Amount of stock option vesting per year | one-third |  |
Stock option expiration years from date of grant years | 10 years |  |
Intrinsic value of options exercised | $ 27 | $ 11 | $ 53
Cash received for option exercises | $ 49 | $ 15 | 114
Employee Stock Option | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 4 years |  |
Unrecognized compensation cost related to non-vested awards granted | $ 18 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 2 years 1 month |  |
Expected dividend yield | 0.00% |  |
Risk-free interest rate | 3.80% |  |
Expected volatility rate | 39.30% |  |
Expected life of option | 5 years |  |
Weighted-average price of shares granted (in dollars per share) | $ 76.99 |  |
Intrinsic value of options exercised | $ 38 |  |
Employee Stock Option | Minimum | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 7 years |  |
Employee Stock Option | Maximum | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 10 years |  |
Restricted stock and restricted stock units | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost related to non-vested awards granted | $ 59 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 3 years |  |
Performance shares | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period in which expenses are recognized | 3 years |  |
Unrecognized compensation cost related to non-vested awards granted | $ 12 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 2 years 9 months 18 days |  |
Performance shares | AspenTech | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 2 years |  |
Percent payout | 25.00% |  |
Performance shares | AspenTech | Share-based Payment Arrangement, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent payout | 175.00% |  |
Performance shares | 2021 Performance Share Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 1,468,000 |  |
Percent payout | 118.00% |  |
Performance shares | 2023 Performance Share Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 975,000 |  |
Performance shares | 2022 Performance Share Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 928,000 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 1,065,000 |  |
Shares vested in period (in shares) | 125,000 |  |
Common shares issued (in shares) | 80,000 |  |
Shares withheld for income taxes (in shares) | 45,000 |  |
Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period in which expenses are recognized | 3 years |  |
Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period in which expenses are recognized | 10 years |  |
Restricted Stock For Non Management Directors Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 22,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 57,000 |  |
Incentive Shares Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 4,437,000 | 5,280,000 |
Shares vested in period (in shares) | 1,814,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 2,700,000 |  |
Total fair value of shares earned/vested (in shares) | $ 158 | $ 158 | $ 131
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |
Unvested shares outstanding (in shares) | 1,065,000 |  |
Shares vested in period (in shares) | 220,000 |  |
Common shares issued (in shares) | 158,000 |  |
Shares withheld for income taxes (in shares) | 62,000 |  |
Restricted Stock Units (RSUs) | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total fair value of shares earned/vested (in shares) | $ 53 |  |
Payment, tax withholding, share-based payment arrangement | $ 19 |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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