Senior Notes (Tables)

6 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Carrying Amounts and Fair Values of Senior Notes

The following table presents the face values and fair values for the Senior Notes at March 31, 2023 and September 30, 2022:

	March 31, 2023				September 30, 2022
	Face Value (*)		Fair Value		Face Value (*)		Fair Value
	(In thousands)
The 2018 Senior Notes	$	400,000	$	393,000	$	400,000	$	381,500
The 2019 Senior Notes and the 2021 Senior Notes	900,000		823,500		900,000		767,250
Total	$	1,300,000	$	1,216,500	$	1,300,000	$	1,148,750

(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $12.9 million and $14.3 million at March 31, 2023 and September 30, 2022, respectively.