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Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 01, 2025 USD ($) | Aug. 05, 2025 USD ($) installment $ / shares shares | Oct. 31, 2025 shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Nov. 14, 2024 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Income tax obligations |  |  |  | $ 20 | $ 5 | $ 0 |
Fair value of stock options granted (in dollars per share) | $ / shares |  |  |  | $ 27.48 |  |  |
Fair value of stock options (in dollars per share) | $ / shares |  |  |  | $ 8.48 |  |  |
Non-cash compensation expense |  |  |  | $ 54 | 52 | 49 |
Non-cash stock-based compensation expense |  |  |  | 54 | $ 52 | $ 49 |
Carrying amount of noncontrolling interest |  | $ 106 |  |  |  |  |
Difference between consideration and the carrying amount of noncontrolling interest |  | 46 |  |  |  |  |
Deferred tax assets, noncontrolling interest |  |  |  | $ 13 |  |  |
Redemption of noncontrolling interests, noncash financing activities |  | 134 |  |  |  |  |
Stock issued |  | 43 |  |  |  |  |
Future stock issuance |  | 81 |  |  |  |  |
Share based liability |  | 12 |  |  |  |  |
Redeemable noncontrolling interests expenditures incurred but not yet paid |  | $ 10 |  |  |  |  |
Omnibus Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share repurchase authorized, amount |  |  |  |  |  |  | $ 100
10K Projects |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired (as a percent) |  | 49.00% |  |  |  |  |
Final purchase price |  | $ 165 |  |  |  |  |
Share issued value |  | $ 112 |  |  |  |  |
10K Projects | Business Combination, First Installment |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of installments | installment |  | 2 |  |  |  |  |
Purchase price of selected assets |  | $ 40 |  |  |  |  |
Issuance of shares (in shares) | shares |  | 1,416,666 |  |  |  |  |
Share issued value |  | $ 43 |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  | $ 30 |  |  |  |  |
10K Projects | Business Combination, First Installment, Payment One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price of selected assets |  | $ 30 |  |  |  |  |
10K Projects | Business Combination, First Installment, Payment Two | Forecast |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price of selected assets | $ 10 |  |  |  |  |  |
10K Projects | Business Combination, Second Installment |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of installments | installment |  | 2 |  |  |  |  |
Share issued value |  | $ 70 |  |  |  |  |
Contingent consideration |  | $ 13 |  |  |  |  |
10K Projects | Business Combination, Second Installment, Payment One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of shares (in shares) | shares |  | 2,333,333 |  |  |  |  |
Share issued value |  | $ 70 |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  | $ 30 |  |  |  |  |
10K Projects | Business Combination, Second Installment, Payment Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  | $ 30 |  |  |  |  |
Contingent consideration |  | $ 13 |  |  |  |  |
Contingent consideration payable (in shares) | shares |  | 416,667 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 30.73 | $ 35.79 | $ 34.93 |
Awards vested in period, intrinsic value |  |  |  | $ 45 | $ 4 | $ 1 |
Unrecognized compensation costs |  |  |  | $ 56 |  |  |
Total compensation of unvested awards expected to be recognized, weighted average period |  |  |  | 2 years 10 months 24 days |  |  |
Deferment period |  |  |  | 30 days |  |  |
Vested (in shares) | shares |  |  |  | 1,442,026 |  |  |
Non-cash stock-based compensation expense |  |  |  | $ 5 | 0 | 13 |
Restricted Stock Units (RSUs) | Restructuring Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-cash stock-based compensation expense |  |  |  | $ 4 | $ 14 | $ 2 |
Performance Shares Units (PSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 0 | $ 43.49 | $ 60.25 |
Unrecognized compensation costs |  |  |  | $ 5 |  |  |
Total compensation of unvested awards expected to be recognized, weighted average period |  |  |  | 1 year |  |  |
Vested (in shares) | shares |  |  |  | 0 |  |  |
Non-cash stock-based compensation expense |  |  |  | $ 11 | $ 8 | $ 4 |
Performance Shares Units (PSUs) | Subsequent Event |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested (in shares) | shares |  |  | 254,731 |  |  |  |
Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  | $ 4 |  |  |
Total compensation of unvested awards expected to be recognized, weighted average period |  |  |  | 3 years 8 months 12 days |  |  |
Class A Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) | shares |  |  |  | 799,748 | 206,298 | 276,516 |
Class A Common Stock | Omnibus Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share repurchase authorized, amount |  |  |  |  |  |  | $ 100
Class A Common Stock | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) | shares |  |  |  |  | 206,000 | 277,000 |
Shares issued under the plan (in shares) | shares |  |  |  | 2,607,027 | 1,738,016 | 869,000 |
Class A Common Stock | Subsequent Event |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) | shares |  |  | 90,588 |  |  |  |
Class B Common Stock | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued under the plan (in shares) | shares |  |  |  |  | 2,270,136 |  |
Omnibus Incentive Plan | Class A Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | shares |  |  |  | 31,169,099 |  |  |
Share awards vesting period |  |  |  | 10 years |  |  |
Shares held in employee stock option plan, allocated (in shares) | shares |  |  |  | 1,812,081 |  |  |
Common stock available for issuance (in shares) | shares |  |  |  | 29,357,018 |  |  |

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