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Debt - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 29, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 16, 2020 | Sep. 30, 2019 | Apr. 30, 2019 | Oct. 09, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  | $ 32,000,000 | $ 36,000,000 | $ 98,000,000 | $ 108,000,000 |  |  |  |
Weighted-average interest rate of total debt | 4.00% |  | 4.00% | 4.50% | 4.00% | 4.50% |  | 4.30% |  |
3.625% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 3.625% |  | 3.625% | 3.625% | 3.625% | 3.625% |  |  |  |
3.625% Senior Secured Notes due 2026 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 3.625% |  | 3.625% |  | 3.625% |  |  |  | 3.625% | 3.625%
5.500% Senior Notes due 2026 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 5.50% |  | 5.50% |  | 5.50% |  |  |  |  |
5.000% Senior Secured Notes due 2023 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 5.00% |  | 5.00% |  | 5.00% |  | 5.00% |  |  |
Redemptions of senior notes | $ 244,000,000 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Scheduled maturities of long-term debt in 2020 | 0 |  | $ 0 |  | $ 0 |  |  |  |  |
Scheduled maturities of long-term debt in 2021 | 0 |  | 0 |  | 0 |  |  |  |  |
Scheduled maturities of long-term debt in 2022 | 0 |  | 0 |  | 0 |  |  |  |  |
Scheduled maturities of long-term debt in 2023 | 300,000,000 |  | 300,000,000 |  | 300,000,000 |  |  |  |  |
Scheduled maturities of long-term debt, thereafter | $ 1,394,000,000 |  | $ 1,394,000,000 |  | $ 1,394,000,000 |  |  |  |  |
Senior Notes | 2.750% Senior Secured Notes due 2028 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 2.75% | 2.75% | 2.75% |  | 2.75% |  |  |  |  |
Senior Notes | 3.875% Senior Secured Notes due 2030 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 3.875% | 3.875% | 3.875% |  | 3.875% |  |  |  |  |
Senior Notes | 5.000% Senior Secured Notes due 2023 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 5.00% | 5.00% | 5.00% |  | 5.00% |  | 5.00% |  |  |
Redemptions of senior notes | $ 244,000,000 | $ 244,000,000 |  |  | $ 569,000,000 |  |  |  |  |

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