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