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v3.24.2.u1

Equity (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | $ 10 | $ 7 | $ 28 | $ 42
Share-based compensation liability |  | 15 |  | 15
Income tax obligations | 5 |  | 5 |
Restricted Stock Units (RSUs) And Common Stock |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense |  |  | 12 |
Restricted Stock Units (RSUs) And Common Stock | Restructuring Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense |  | 2 |  | 2
Performance Shares |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | $ 3 | $ 1 | 6 | 2
Additional Paid-in Capital |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense |  |  | $ 15 | $ 27
Common Stock | Class A Common Stock |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Shares issued under the plan (in shares) |  |  | 1,738,016 | 869,000
Shares issued under omnibus incentive plan (in shares) | 7,428 | 17,000 | 185,115 | 273,000
Common Stock | Class B Common Stock |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Shares issued under the plan (in shares) |  |  | 1,335,169 |

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