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Senior Notes (Tables)
3 Months Ended
Dec. 31, 2021
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, 2021 and September 30, 2021:
 December 31, 2021September 30, 2021
 Face Value (*)Fair ValueFace Value (*) Fair Value
 (In thousands)
The 2018 Senior Notes400,000 437,000 400,000 453,000 
The 2019 Senior Notes and the 2021 Senior Notes900,000 920,250 350,000 357,000 
       Total $1,300,000 $1,357,250 $750,000 $810,000 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $15.8 million and $9.0 million at December 31, 2021 and September 30, 2021, respectively.