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Percentage of options granted at the closing market price of common stock on the grant dat

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Stock option expiration years from date of grants.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	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