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Debt (Tables) | 6 Months Ended
--- | ---
Mar. 31, 2025
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Long-term debt at March 31, 2025 and September 30, 2024 consisted of the following:
| March 31, 2025 |  | September 30, 2024
| (In thousands)
Unsecured 3.00% Senior Notes, due June 2027 | $ | 500,000 |  |  | $ | 500,000 |
Unsecured 2.625% Senior Notes, due September 2029 | 500,000 |  |  | 500,000 |
Unsecured 1.50% Senior Notes, due January 2031 | 600,000 |  |  | 600,000 |
Unsecured 5.45% Senior Notes, due October 2032 | 300,000 |  |  | 300,000 |
Unsecured 5.90% Senior Notes, due November 2033 | 725,000 |  |  | 725,000 |
Unsecured 5.95% Senior Notes, due October 2034 | 200,000 |  |  | 200,000 |
Unsecured 5.50% Senior Notes, due June 2041 | 400,000 |  |  | 400,000 |
Unsecured 4.15% Senior Notes, due January 2043 | 500,000 |  |  | 500,000 |
Unsecured 4.125% Senior Notes, due October 2044 | 750,000 |  |  | 750,000 |
Unsecured 4.30% Senior Notes, due October 2048 | 600,000 |  |  | 600,000 |
Unsecured 4.125% Senior Notes, due March 2049 | 450,000 |  |  | 450,000 |
Unsecured 3.375% Senior Notes, due September 2049 | 500,000 |  |  | 500,000 |
Unsecured 2.85% Senior Notes, due February 2052 | 600,000 |  |  | 600,000 |
Unsecured 5.75% Senior Notes, due October 2052 | 500,000 |  |  | 500,000 |
Unsecured 6.20% Senior Notes, due November 2053 | 500,000 |  |  | 500,000 |
Unsecured 5.00% Senior Notes, due December 2054 | 650,000 |  |  | — |
Medium-term note Series A, 1995-1, 6.67%, due December 2025 | 10,000 |  |  | 10,000 |
Unsecured 6.75% Debentures, due July 2028 | 150,000 |  |  | 150,000 |
Finance lease obligations | 48,075 |  |  | 48,890 |
Total long-term debt | 8,483,075 |  |  | 7,833,890 |
Less: |  |  |
Original issue premium on unsecured senior notes and debentures | (3,825) |  |  | (9,071) |
Debt issuance cost | 61,463 |  |  | 57,664 |
Current maturities of long-term debt | 11,712 |  |  | 1,651 |
Total long-term debt, net | $ | 8,413,725 |  |  | $ | 7,783,646 |

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