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Equity - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Non-cash stock-based compensation expense | $ 9 | $ 14
Share-Based Payment Arrangement, Tranche Two |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Share-based compensation liability |  | 10
Additional Paid-in Capital |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Non-cash stock-based compensation expense | $ 15 | $ 4
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) | 7,000 | 5,000
Common Stock | Class B Common Stock |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Shares issued under the plan (in shares) | 547,249 |

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