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Debt - Additional Information (Detail) € in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 15, 2021 USD ($) | Mar. 08, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Apr. 14, 2021 USD ($) | Jan. 20, 2021 USD ($) | Nov. 02, 2020 USD ($) | Sep. 30, 2020 EUR (€) | Aug. 12, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 12,000,000 | $ 0 | $ 12,000,000 | $ 0 |  |  |  |  |  |
Interest expense, net |  |  | $ 30,000,000 | $ 32,000,000 | $ 93,000,000 | $ 98,000,000 |  |  |  |  |  |
Weighted-average interest rate of total debt |  |  | 3.40% | 4.00% | 3.40% | 4.00% | 3.40% |  |  |  | 3.70% |
3.625% Senior Secured Notes due 2026 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.625% |  | 3.625% |  | 3.625% |  |  |  |  |
Face or principal amount of debt instrument | € |  |  |  |  |  |  | € 445 |  |  |  | € 445 |
5.500% Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.50% | 5.50% | 5.50% | 5.50% | 5.50% |  |  |  |  |
5.500% Senior Notes due 2026 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.50% | 5.50% | 5.50% |  | 5.50% |  | 5.50% |  |  |  |  |
Debt instrument remaining outstanding amount | $ 343,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed | 102.75% |  |  |  |  |  |  |  |  |  |  |
2.750% Senior Secured Notes due 2028 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.75% |  | 2.75% |  | 2.75% |  |  |  |  |
Face or principal amount of debt instrument | € |  |  |  |  |  |  | € 325 |  |  |  | € 325 |
3.875% Senior Secured Notes due 2030 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.875% |  | 3.875% |  | 3.875% |  | 3.875% |  |  |
3.000% Senior Secured Notes due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |  |
3.000% Senior Secured Notes due 2031 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.00% |  | 3.00% |  | 3.00% |  | 3.00% | 3.00% |  | 3.00%
Face or principal amount of debt instrument |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |
Senior Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt fees |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Capitalized debt fees |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Senior Term Loan Facility | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face or principal amount of debt instrument | $ 1,145,000,000 |  |  |  |  |  |  | $ 325,000,000 |  |  |  |
Line of credit facility, increase |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |
Maximum commitments under the facility |  | $ 1,145,000,000 |  |  |  |  |  |  |  |  |  |
2.750% Senior Secured Notes due 2028 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 2.75% |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of long-term debt in 2021 |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Scheduled maturities of long-term debt in 2022 |  |  | 0 |  | 0 |  |  |  |  |  |  |
Scheduled maturities of long-term debt in 2023 |  |  | 0 |  | 0 |  |  |  |  |  |  |
Scheduled maturities of long-term debt in 2024 |  |  | 0 |  | 0 |  |  |  |  |  |  |
Scheduled maturities of long-term debt, 2025 |  |  | 0 |  | 0 |  |  |  |  |  |  |
Scheduled maturities of long-term debt, 2026 |  |  | 531,000,000 |  | 531,000,000 |  |  |  |  |  |  |
Scheduled maturities of long-term debt, thereafter |  |  | $ 1,722,000,000 |  | $ 1,722,000,000 |  |  |  |  |  |  |

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