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Senior Notes
 6 Months Ended
Mar. 31, 2022
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”). The 2019 Senior Notes require interest payments semi-annually at a rate of 4.00% per annum and will mature on June 15, 2028.
On December 17, 2021, we issued $550 million of additional senior notes of the same class as the 2019 Senior Notes in a private offering to qualified institutional investors (the “2021 Senior Notes,” and collectively with the 2018 Senior Notes and the 2019 Senior Notes, the “Senior Notes”). The 2021 Senior Notes require interest payments semi-annually at a rate of 4.00% per annum and will mature on June 15, 2028, the same date as the 2019 Senior Notes.
The indentures for the Senior Notes contain certain covenants typical of unsecured obligations.
The following table presents the face values and fair values for the Senior Notes at March 31, 2022 and September 30, 2021:
 March 31, 2022September 30, 2021
 Face Value (*)Fair ValueFace Value (*) Fair Value
 (In thousands)
The 2018 Senior Notes$400,000 $416,000 $400,000 $453,000 
The 2019 Senior Notes and the 2021 Senior Notes900,000 871,875 350,000 357,000 
       Total $1,300,000 $1,287,875 $750,000 $810,000 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $15.7 million and $9.0 million at March 31, 2022 and September 30, 2021, respectively.