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v3.23.1

Equity - Narrative (Detail) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | $ 21 |  | $ 35 | $ 30
Share-based compensation liability |  | $ 4 |  | 4
Share-Based Payment Arrangement, Tranche One |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Share-based compensation liability | 12 |  | 12 |
Share-Based Payment Arrangement, Tranche Two |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Share-based compensation liability | 15 |  | 15 |
Restricted Stock Units (RSUs) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | 12 |  |  |
Restricted Stock Units (RSUs) | Restructuring Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | 2 |  | 2 |
Performance Share Units (PSUs) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | 1 |  | 1 |
Additional Paid-in Capital |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | 9 |  | 20 | $ 26
Additional Paid-in Capital | Share-Based Payment Arrangement, Tranche One |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Share-based compensation liability | 7 |  | 7 |
Additional Paid-in Capital | Share-Based Payment Arrangement, Tranche Two |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Share-based compensation liability | 5 |  | 5 |
Additional Paid-in Capital | Restricted Stock Units (RSUs) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Non-cash stock-based compensation expense | $ 2 |  | $ 10 |
Common Stock | Class A Common Stock |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Shares issued under the Plan (in shares) |  |  | 869 |
Shares issued under Omnibus Incentive Plan (in shares) | 251 | 35 | 256 | 186

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