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Senior Notes (Tables)
 12 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Principal Amounts Carrying amounts and Fair Values of Senior Notes
The following table presents the face values and fair values for the Senior Notes at September 30, 2023 and 2022: 
 September 30, 2023September 30, 2022
 Face Value (*)Fair ValueFace Value (*)Fair Value
 (In thousands)
The 2018 Senior Notes$400,000 $386,000 $400,000 $381,500 
The 2019 Senior Notes and the 2021 Senior Notes900,000 803,250 900,000 767,250 
      Total$1,300,000 $1,189,250 $1,300,000 $1,148,750 
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $11.5 million and $14.3 million at September 30, 2023 and 2022, respectively.
Future Principal Payments For the Senior Notes
Future principal payments for the term loan are as follows:
Year Ending September 30,(In thousands)
2024$15,000 
202515,000 
2026243,750 
       Total$273,750 
Future principal payments for the Senior Notes are as follows:
Year Ending September 30,(In thousands)
2026400,000 
2027— 
2028900,000 
       Total$1,300,000