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Debt - 3.625% Senior Secured Notes Offering - Additional Information (Detail) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 EUR (€) | Nov. 05, 2018 USD ($) | Oct. 12, 2018 EUR (€) | Oct. 09, 2018 USD ($) | Jun. 30, 2020 EUR (€) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Jun. 30, 2019 | Apr. 30, 2019 EUR (€) | Oct. 09, 2018 EUR (€)
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Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt instrument | $ 3,019,000,000.000 |  |  |  |  |  | $ 2,998,000,000 |  |  |  |
3.625% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 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%
Aggregate principal amount of debt instrument | $ 499,000,000 |  |  |  |  | € 445,000,000 | 487,000,000 | € 445,000,000 |  | € 195,000,000 | € 250,000,000
4.125% Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.125% |  |  |  |  | 4.125% |  |  | 4.125% |  |
4.125% Senior Secured Notes due 2024 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.125% |  |  | 4.125% | 4.125% | 4.125% |  |  |  |  | 4.125%
Aggregate principal amount of debt instrument | $ 349,000,000 |  |  |  |  | € 311,000,000 | 340,000,000 | € 311,000,000 |  |  |
Redemptions of senior notes | € |  | € 311,000,000 |  | € 34,500,000 |  |  |  |  |  |  |
4.875% Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.875% |  |  |  |  | 4.875% |  |  | 4.875% |  |
4.875% Senior Secured Notes due 2024 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.875% |  |  |  | 4.875% | 4.875% |  |  |  |  | 4.875%
Aggregate principal amount of debt instrument | $ 220,000,000 |  |  |  | $ 30,000,000 |  | $ 220,000,000 |  |  |  |
Redemptions of senior notes | $ 220,000,000 |  |  |  |  |  |  |  |  |  |
5.625% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.625% |  |  |  |  | 5.625% |  |  | 5.625% |  |
5.625% Senior Secured Notes | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.625% |  | 5.625% |  |  |  |  | 5.625% | 5.625%
Redemptions of senior notes |  |  | $ 26,550,000 |  | $ 26,550,000 |  |  |  |  |  |

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