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Senior Notes (Tables)
9 Months Ended
Jun. 30, 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 June 30, 2022 and September 30, 2021:
 June 30, 2022September 30, 2021
 Face Value (*)Fair ValueFace Value (*) Fair Value
 (In thousands)
The 2018 Senior Notes$400,000 $388,000 $400,000 $453,000 
The 2019 Senior Notes and the 2021 Senior Notes900,000 801,000 350,000 357,000 
       Total $1,300,000 $1,189,000 $750,000 $810,000 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $15.0 million and $9.0 million at June 30, 2022 and September 30, 2021, respectively.