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Senior Notes
 12 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Senior Notes Senior Notes
On May 8, 2018, we issued $400 million of senior notes in a private offering to qualified institutional investors (the “2018 Senior Notes”). The 2018 Senior Notes require interest payments semi-annually at a rate of 5.25% per annum and will mature on May 15, 2026.
On December 6, 2019, we issued $350 million of senior notes in a private offering to qualified institutional investors (the “2019 Senior Notes,” along with the 2018 Senior Notes, the “Senior Notes”). The 2019 Senior Notes require interest payments semi-annually at a rate of 4.00% per annum and will mature on June 15, 2028.
The indentures for the 2018 Senior Notes and the 2019 Senior Notes contain customary affirmative and negative covenants, including certain events of default, typical of unsecured obligations.
The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2021 and 2020: 
 September 30, 2021September 30, 2020
 Face Value (*)Fair ValueFace Value (*)Fair Value
 (In thousands)
The 2018 Senior Notes400,000 453,000 400,000 442,000 
The 2019 Senior Notes350,000 357,000 350,000 358,750 
      Total$750,000 $810,000 $750,000 $800,750 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $9.0 million and $10.6 million at September 30, 2021 and 2020, respectively.
Future principal payments for the Senior Notes are as follows (in thousands):
Year Ending September 30, 
2026400,000 
Thereafter350,000 
       Total$750,000