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Senior Notes (Tables)
3 Months Ended
Dec. 31, 2022
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 December 31, 2022 and September 30, 2022:
 December 31, 2022September 30, 2022
 Face Value (*)Fair ValueFace Value (*) Fair Value
 (In thousands)
The 2018 Senior Notes$400,000 $390,000 $400,000 $381,500 
The 2019 Senior Notes and the 2021 Senior Notes900,000 812,250 900,000 767,250 
       Total $1,300,000 $1,202,250 $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 $13.6 million and $14.3 million at December 31, 2022 and September 30, 2022, respectively.