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v3.20.2

Debt - Open Market Purchase (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019 | Oct. 09, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt | $ 0 | $ 4,000,000 | $ 0 | $ 7,000,000 |  |
Acquisition Corp. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount of debt instrument | $ 3,019,000,000.000 |  | $ 3,019,000,000.000 |  | $ 2,998,000,000 |
4.875% Senior Secured Notes due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.875% | 4.875% | 4.875% | 4.875% |  |
4.875% Senior Secured Notes due 2024 | Acquisition Corp. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount of debt instrument | $ 220,000,000 |  | $ 220,000,000 |  | $ 220,000,000 | $ 30,000,000
Interest rate | 4.875% |  | 4.875% |  |  | 4.875%
Debt instrument remaining outstanding amount |  |  |  |  |  | $ 220,000,000
Loss on extinguishment of debt |  |  |  | $ 1,000,000 |  |

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