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Debt - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 30, 2024 | Jan. 24, 2024 USD ($) Rate | Jan. 27, 2023 | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Nov. 30, 2023 USD ($) | Nov. 29, 2023 USD ($) | Sep. 30, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 4,020,000,000 |  |  |  | $ 4,020,000,000 |  | $ 4,020,000,000 |  |  |  | $ 4,002,000,000
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  |  |  | 3.50 |  | 3.50 |  |  |  |
Partial repayment of Senior Term Loan Facility refinancing |  |  |  |  |  |  | $ 42,000,000 | $ 0 |  |  |
Interest expense, net |  |  |  |  | $ 42,000,000 | $ 35,000,000 | 81,000,000 | 67,000,000 |  |  |
Interest expense, debt |  |  |  |  | $ 46,000,000 | $ 38,000,000 | $ 91,000,000 | $ 75,000,000 |  |  |
Weighted-average interest rate of total debt | 4.50% |  |  |  | 4.50% | 4.00% | 4.50% | 4.00% |  |  | 4.10%
Third-Parties |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt fees |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Creditors |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt fees |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturities, repayments of principal in next rolling twelve months | $ 0 |  |  |  | $ 0 |  | $ 0 |  |  |  |
Long-term debt, maturities, repayments of principal in rolling year five | 351,000,000 |  |  |  | 351,000,000 |  | 351,000,000 |  |  |  |
Long term debt maturities repayments of principal in rolling after year five | $ 2,356,000,000 |  |  |  | $ 2,356,000,000 |  | $ 2,356,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  |  |  | 3.50 |  | 3.50 |  |  |  |
2020 Revolving Loans | Revolving Credit Facility | Eurodollar Applicable Margin Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate | 1.375% | 1.875% |  |  |  |  |  |  |  |  |
2020 Revolving Loans | Revolving Credit Facility | ABR Applicable Margin Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate | 0.375% | 0.875% |  |  |  |  |  |  |  |  |
Mortgage Term Loan due 2033 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Partial proceeds from Senior Term Loan Facility refinancing |  |  |  |  |  |  | $ 0 | $ 19,000,000 |  |  |
Senior Term Loan Facility due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Partial proceeds from Senior Term Loan Facility refinancing |  |  |  |  |  |  | 42,000,000 | $ 147,000,000 |  |  |
Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 1,295,000,000 |  |  |  | $ 1,295,000,000 |  | 1,295,000,000 |  |  |  |
Debt instrument, marginal interest rate | Rate |  |  | 2.00% |  |  |  |  |  |  |  |
Acquisition Corp. | Federal Funds Effective Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate | Rate |  |  | 0.50% |  |  |  |  |  |  |  |
Acquisition Corp. | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate | Rate |  |  | 1.00% |  |  |  |  |  |  |  |
Acquisition Corp. | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  | 1.00% |  |  |  |  |  |  |  |
Acquisition Corp. | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | 0 |  |  |  | 0 |  | 0 |  |  |  | $ 0
Debt instrument, covenant, total indebtedness to EBITDA ratio |  |  |  |  |  |  |  |  | 3.60 |  |
Commitments under revolving credit facility | $ 350,000,000 |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  | $ 350,000,000 | $ 300,000,000 | 300,000,000
Increase in secured indebtedness to EBITDA |  |  |  |  |  |  |  |  | 140,000,000 | $ 105,000,000 |
Secured indebtedness of EBITDA |  |  |  |  |  |  |  |  | $ 250,000,000 |  |
Senior secured indebtedness to EBITDA ratio |  |  |  |  |  |  |  |  | 5.00 |  |
Senior secured indebtedness, maximum amount |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Term loan base rate plus election rate | 1.00% |  |  |  | 1.00% |  | 1.00% |  |  |  |
Interest rate applicable to overdue principal |  |  |  |  |  |  | 2.00% |  |  |  |
Acquisition Corp. | Revolving Credit Facility | Federal Funds Effective Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 0.50% |  |  |  |
Acquisition Corp. | 2.750% Senior Secured Notes due 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 351,000,000 |  |  |  | $ 351,000,000 |  | $ 351,000,000 |  |  |  | 343,000,000
Interest rate | 2.75% |  |  |  | 2.75% |  | 2.75% |  |  |  |
Acquisition Corp. | 3.750% Senior Secured Notes due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 540,000,000 |  |  |  | $ 540,000,000 |  | $ 540,000,000 |  |  |  | 540,000,000
Interest rate | 3.75% |  |  |  | 3.75% |  | 3.75% |  |  |  |
Acquisition Corp. | 3.875% Senior Secured Notes due 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 535,000,000 |  |  |  | $ 535,000,000 |  | $ 535,000,000 |  |  |  | 535,000,000
Interest rate | 3.875% |  |  |  | 3.875% |  | 3.875% |  |  |  |
Acquisition Corp. | 2.250% Senior Secured Notes due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 481,000,000 |  |  |  | $ 481,000,000 |  | $ 481,000,000 |  |  |  | 471,000,000
Interest rate | 2.25% |  |  |  | 2.25% |  | 2.25% |  |  |  |
Acquisition Corp. | 3.000% Senior Secured Notes due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 800,000,000 |  |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  |  | 800,000,000
Interest rate | 3.00% |  |  |  | 3.00% |  | 3.00% |  |  |  |
Acquisition Corp. | Initial Revolving Loans | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 0.75% |  |  |  |
Acquisition Corp. | Initial Revolving Loans | Revolving Credit Facility | London Interbank Offered Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 1.75% |  |  |  |
Acquisition Corp. | 2020 Revolving Loans | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior secured indebtedness to EBITDA ratio | 2.44 |  |  |  | 2.44 |  | 2.44 |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 0.875% |  |  |  |
Acquisition Corp. | 2020 Revolving Loans | Revolving Credit Facility | London Interbank Offered Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 1.875% |  |  |  |
Acquisition Corp. | Senior Term Loan Facility -Tranche G | Federal Funds Effective Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 0.50% |  |  |  |
Acquisition Corp. | Senior Term Loan Facility -Tranche G | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 2.00% |  |  |  |
Acquisition Corp. | Senior Term Loan Facility -Tranche G | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  |  |  |  | 1.00% |  |  |  |
Term loan base rate plus election rate | 1.00% |  |  |  | 1.00% |  | 1.00% |  |  |  |
Additional Interest rate on other overdue amounts |  |  |  |  |  |  | 2.00% |  |  |  |
Acquisition Corp. | Mortgage Term Loan due 2033 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 18,000,000 |  |  |  | $ 18,000,000 |  | $ 18,000,000 |  |  |  | $ 18,000,000
Acquisition Corp. | Mortgage Term Loan due 2033 | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, marginal interest rate |  |  |  | 1.40% |  |  |  |  |  |  |

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