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Debt (Tables)
 6 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Components of Long-Term Debt Including Associated Interest Rates and Related Estimated Fair Values
Components of long-term debt including the associated interest rates and related estimated fair values by calendar maturity (in millions, except interest rates):
Mar 31, 2024Oct 1, 2023Stated Interest Rate
Effective Interest Rate(1)
IssuanceAmountEstimated Fair ValueAmountEstimated Fair Value
October 2023 notes(2)
$— $— $750.0 $749.9 3.850 %2.859 %
February 2024 notes(3)
— — 500.0 504.2 5.848 %6.079 %
March 2024 notes(4)
— — 569.3 569.3 0.372 %0.462 %
August 2025 notes1,250.0 1,225.4 1,250.0 1,210.5 3.800 %3.721 %
February 2026 notes1,000.0 994.3 1,000.0 985.5 4.750 %4.788 %
June 2026 notes500.0 472.5 500.0 463.5 2.450 %2.511 %
February 2027 notes1,000.0 998.0 — — 4.850 %4.958 %
March 2027 notes500.0 459.6 500.0 446.1 2.000 %2.058 %
March 2028 notes600.0 570.4 600.0 554.7 3.500 %3.529 %
November 2028 notes750.0 726.8 750.0 704.5 4.000 %3.958 %
August 2029 notes(2)
1,000.0 942.6 1,000.0 904.1 3.550 %3.840 %
March 2030 notes750.0 646.4 750.0 615.1 2.250 %3.084 %
November 2030 notes1,250.0 1,083.6 1,250.0 1,027.1 2.550 %2.582 %
February 2031 notes500.0 497.4 — — 4.900 %5.046 %
February 2032 notes1,000.0 874.8 1,000.0 828.0 3.000 %3.155 %
February 2033 notes500.0 495.0 500.0 470.7 4.800 %3.798 %
February 2034 notes500.0 496.5 — — 5.000 %5.127 %
June 2045 notes350.0 303.7 350.0 275.3 4.300 %4.348 %
December 2047 notes500.0 393.7 500.0 354.0 3.750 %3.765 %
November 2048 notes1,000.0 878.0 1,000.0 799.0 4.500 %4.504 %
August 2049 notes1,000.0 869.5 1,000.0 792.7 4.450 %4.447 %
March 2050 notes500.0 355.8 500.0 328.6 3.350 %3.362 %
November 2050 notes1,250.0 925.9 1,250.0 843.4 3.500 %3.528 %
Total15,700.0 14,209.9 15,519.3 13,426.2 
Aggregate debt issuance costs and unamortized premium/(discount), net(121.1)(113.1)
Hedge accounting fair value adjustment(2)
(31.4)(40.0)
Total$15,547.5 $15,366.2 
(1)Includes the effects of the amortization of any premium or discount and any gain or loss upon settlement of related treasury locks or forward-starting interest rate swaps utilized to hedge interest rate risk prior to the debt issuance.
(2)Amount includes the change in fair value due to changes in benchmark interest rates related to hedging our October 2023 notes and $350.0 million of our August 2029 notes. Refer to Note 3, Derivative Financial Instruments, for additional information on our interest rate swap agreements designated as fair value hedges.
(3)Floating rate notes that bear interest at a rate equal to Compounded SOFR (as defined in the February 2024 notes) plus 0.420%, resulting in a stated interest rate of 5.848% at maturity on February 14, 2024.
(4)Japanese yen-denominated long-term debt.
Long-Term Debt Maturities
The following table summarizes our long-term debt maturities as of March 31, 2024 by fiscal year (in millions):
Fiscal Year Total
2024$— 
20251,250.0 
20261,500.0 
20271,500.0 
2028600.0 
Thereafter10,850.0 
Total$15,700.0