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Senior Notes (Tables)
6 Months Ended
Mar. 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 March 31, 2021 and September 30, 2020:
 March 31, 2021September 30, 2020
 Face Value (*)Fair ValueFace Value (*) Fair Value
 (In thousands)
The 2018 Senior Notes400,000 442,000 400,000 442,000 
The 2019 Senior Notes350,000 357,000 350,000 358,750 
       Total $750,000 $799,000 $750,000 $800,750 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $9.8 million and $10.6 million at March 31, 2021 and September 30, 2020, respectively.