Debt (Table)

6 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt at March 31, 2020 and September 30, 2019 consisted of the following:

	March 31, 2020		September 30, 2019
	(In thousands)
Unsecured 3.00% Senior Notes, due 2027	$	500,000	$	500,000
Unsecured 2.625% Senior Notes, due 2029	300,000		—
Unsecured 5.95% Senior Notes, due 2034	200,000		200,000
Unsecured 5.50% Senior Notes, due 2041	400,000		400,000
Unsecured 4.15% Senior Notes, due 2043	500,000		500,000
Unsecured 4.125% Senior Notes, due 2044	750,000		750,000
Unsecured 4.30% Senior Notes, due 2048	600,000		600,000
Unsecured 4.125% Senior Notes, due 2049	450,000		450,000
Unsecured 3.375% Senior Notes, due 2049	500,000		—
Medium-term note Series A, 1995-1, 6.67%, due 2025	10,000		10,000
Unsecured 6.75% Debentures, due 2028	150,000		150,000
Finance lease obligations (see Note 6)	6,666		—
Total long-term debt	4,366,666		3,560,000
Less:
Original issue (premium) / discount on unsecured senior notes and debentures	663		193
Debt issuance cost	37,006		30,355
Current maturities	131		—
	$	4,328,866	$	3,529,452