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DEBT - Schedule of Debt (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Aug. 19, 2025 | May 20, 2025 | Sep. 30, 2024
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs | $ (163.0) |  |  | $ (136.0)
Original Issue Discount | (66.0) |  |  | (51.0)
Short-term borrowings—trade receivable securitization facility | 724.0 |  |  | 486.0
Gross Amount | 29,520.0 |  |  | 24,581.0
Net Amount | 29,291.0 |  |  | 24,394.0
Finance lease obligations | 284.0 |  |  | 262.0
Current portion of long-term debt | 124.0 |  |  | 98.0
Long-term Debt, Gross and Lease Obligation | 29,395.0 |  |  | 24,482.0
Deferred Finance Costs, Excluding Current Maturities | (162.0) |  |  | (135.0)
Debt Instrument, Unamortized Discount, Excluding Current Maturities | (66.0) |  |  | (51.0)
LONG-TERM DEBT | 29,167.0 |  |  | 24,296.0
Term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs | (43.0) |  |  | (25.0)
Original Issue Discount | (33.0) |  |  | (35.0)
Gross Amount | 11,124.0 |  |  | 8,702.0
Net Amount | $ 11,048.0 |  |  | 8,642.0
Secured Debt | 6.750% secured notes due 2028 (“2028 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.75% |  |  |
Debt Issuance Costs | $ (11.0) |  |  | (15.0)
Original Issue Discount | (6.0) |  |  | (8.0)
Gross Amount | 2,100.0 |  |  | 2,100.0
Net Amount | $ 2,083.0 |  |  | 2,077.0
Secured Debt | 6.875% secured notes due 2030 (“2030 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.875% |  |  |
Debt Issuance Costs | $ (10.0) |  |  | (12.0)
Original Issue Discount | 0.0 |  |  | 0.0
Gross Amount | 1,450.0 |  |  | 1,450.0
Net Amount | $ 1,440.0 |  |  | 1,438.0
Secured Debt | 6.375% secured notes due 2029 (“2029 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.375% |  |  |
Debt Issuance Costs | $ (17.0) |  |  | (22.0)
Original Issue Discount | (1.0) |  |  | (1.0)
Gross Amount | 2,750.0 |  |  | 2,750.0
Net Amount | $ 2,732.0 |  |  | 2,727.0
Secured Debt | 7.125% secured notes due 2031 (“2031 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 7.125% |  |  |
Debt Issuance Costs | $ (8.0) |  |  | (9.0)
Original Issue Discount | (6.0) |  |  | (7.0)
Gross Amount | 1,000.0 |  |  | 1,000.0
Net Amount | $ 986.0 |  |  | 984.0
Secured Debt | 6.625% secured notes due 2032 (“2032 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.625% |  |  |
Debt Issuance Costs | $ (17.0) |  |  | (20.0)
Original Issue Discount | 0.0 |  |  | 0.0
Gross Amount | 2,200.0 |  |  | 2,200.0
Net Amount | $ 2,183.0 |  |  | 2,180.0
Secured Debt | 6.000% secured notes due 2033 (“2033 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.00% |  |  |
Debt Issuance Costs | $ (12.0) |  |  | (14.0)
Original Issue Discount | 0.0 |  |  | 0.0
Gross Amount | 1,500.0 |  |  | 1,500.0
Net Amount | 1,488.0 |  |  | 1,486.0
Secured Debt | 6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net Amount | $ 2,616.0 |  |  | 0.0
Secured Debt | 6.250% secured notes due 2034 (“2034 Secured Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.25% | 6.25% |  |
Debt Issuance Costs | $ (5.0) |  |  |
Original Issue Discount | 0.0 |  |  |
Gross Amount | 500.0 |  |  |
Net Amount | 495.0 |  |  | 0.0
Secured Debt | 6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net Amount | $ 1,982.0 |  |  | 0.0
Senior Subordinated Notes | 5.500% senior subordinated notes due 2027 (“5.500% 2027 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 5.50% |  |  |
Debt Issuance Costs |  |  |  | (9.0)
Original Issue Discount |  |  |  | 0.0
Gross Amount |  |  |  | 2,650.0
Net Amount | $ 0.0 |  |  | 2,641.0
Senior Subordinated Notes | 4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.625% |  |  |
Debt Issuance Costs | $ (5.0) |  |  | (6.0)
Original Issue Discount | 0.0 |  |  | 0.0
Gross Amount | 1,200.0 |  |  | 1,200.0
Net Amount | $ 1,195.0 |  |  | 1,194.0
Senior Subordinated Notes | 4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.875% |  |  |
Debt Issuance Costs | $ (3.0) |  |  | (4.0)
Original Issue Discount | 0.0 |  |  | 0.0
Gross Amount | 750.0 |  |  | 750.0
Net Amount | $ 747.0 |  |  | 746.0
Senior Subordinated Notes | 6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.375% |  | 6.375% |
Debt Issuance Costs | $ (14.0) |  |  |
Original Issue Discount | (20.0) |  |  |
Gross Amount | 2,650.0 |  |  |
Net Amount | $ 2,616.0 |  |  |
Senior Subordinated Notes | 6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.75% | 6.75% |  |
Debt Issuance Costs | $ (18.0) |  |  |
Original Issue Discount | 0.0 |  |  |
Gross Amount | 2,000.0 |  |  |
Net Amount | 1,982.0 |  |  |
Government Refundable Advances |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs | 0.0 |  |  | 0.0
Original Issue Discount | 0.0 |  |  | 0.0
Net Amount | 12.0 |  |  | 17.0
Government refundable advances | 12.0 |  |  | 17.0
Finance Lease Obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs | 0.0 |  |  |
Original Issue Discount | 0.0 |  |  |
Finance lease obligations | 284.0 |  |  |
Long-term Debt, Current Maturities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs | (1.0) |  |  | (1.0)
Original Issue Discount | 0.0 |  |  | 0.0
Less: current portion | 125.0 |  |  | 99.0
Current portion of long-term debt | 124.0 |  |  | 98.0
Finance Lease Obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs |  |  |  | 0.0
Original Issue Discount |  |  |  | 0.0
Finance lease obligations | 284.0 |  |  | 262.0
Asset-backed Securities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings—trade receivable securitization facility, Gross | 725.0 |  |  | 487.0
Debt Issuance Costs | (1.0) |  |  | (1.0)
Original Issue Discount | 0.0 |  |  | 0.0
Short-term borrowings—trade receivable securitization facility | $ 724.0 |  |  | $ 486.0

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