| Schedule of Long-term Debt Instruments |
Long-term debt at March 31, 2026 and September 30, 2025 consisted of the following: | | | | | | | | | | | | | March 31, 2026 | | September 30, 2025 | | | (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 5.20% Senior Notes, due August 2035 | 500,000 | | | 500,000 | | 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 | | | 650,000 | | Unsecured 5.45% Senior Notes, due January 2056 | 600,000 | | | — | | Medium-term note Series A, 1995-1, 6.67%, due December 2025 | — | | | 10,000 | | Unsecured 6.75% Debentures, due July 2028 | 150,000 | | | 150,000 | | | Finance lease obligations | 101,802 | | | 47,234 | | | Total long-term debt | 9,626,802 | | | 8,982,234 | | | Less: | | | | | Original issue (premium) discount on unsecured senior notes and debentures | 2,602 | | | (1,332) | | | Debt issuance cost | 67,576 | | | 64,622 | | | Current maturities of long-term debt | 2,395 | | | 11,775 | | | Total long-term debt, net | $ | 9,554,229 | | | $ | 8,907,169 | |
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