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v3.23.3

Equity - 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] |  |  |
Non-cash compensation expense | $ 49 | $ 39 | $ 45
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 39.81 | $ 44.38 | $ 32.23
Awards vested in period, intrinsic value | $ 1 | $ 18 | $ 0
Unrecognized compensation costs | $ 50 |  |
Total compensation of unvested awards expected to be recognized, weighted average period | 2 years 4 months 24 days |  |
Non-cash stock-based compensation expense | $ 13 |  |
Restricted Stock Units (RSUs) | Restructuring Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | 2 |  |
Market Based Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | $ 4 |  |
Class A Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued under Omnibus Incentive Plan (in shares) | 276,516 | 463,826 | 36,206
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) | 277,000 | 187,000 | 36,000
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) | 276,565 | 277,000 |
Shares issued under the Plan (in shares) | 869,008 |  | 4,321,000
Exchange of Class B shares for Class A shares (in shares) |  | 14,320,547 | 19,234,000
Conversion of Class B shares to Class A shares (in shares) |  | 14,321,000 | 10,245,000
Common Class B |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock redeemed during period (in shares) |  | 510,165 |
Conversion of Class B shares to Class A shares (in shares) |  | 13,810,382 |
Common Class B | Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exchange of Class B shares for Class A shares (in shares) |  |  | 19,234,000
Conversion of Class B shares to Class A shares (in shares) |  | 14,321,000 | 10,245,000
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) | 31,169,099 |  |
Share awards vesting period | 10 years |  |
Shares held in employee stock option plan, allocated (in shares) | 805,035 |  |
Common stock available for issuance (in shares) | 30,364,190 |  |
Omnibus Incentive Plan | Class A Common Stock | IPO |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | 1,000,000 |  |

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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 + Details
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