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Senior Notes (Tables)
12 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Senior Notes The 2010 Senior Notes were issued in four series as follows:
        
Series
Amount
Interest Rate
Maturity Date
 
(In millions)
 
 
E
$
60.0

4.72
%
July 14, 2016
F
$
72.0

5.04
%
July 14, 2017
G
$
28.0

5.42
%
July 14, 2019
H
$
85.0

5.59
%
July 14, 2020

Principal Amounts Carrying amounts and Fair Values of Senior Notes
The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2020 and 2019: 
 
September 30, 2020

September 30, 2019
 
Face Value (*)

Fair Value

Face Value (*)

Fair Value
 
(In thousands)
The 2010 Senior Notes
$


$


$
85,000


$
86,121

The 2018 Senior Notes
400,000

 
442,000

 
400,000

 
428,000

The 2019 Senior Notes
350,000

 
358,750

 

 

      Total
$
750,000

 
$
800,750

 
$
485,000

 
$
514,121

 
(*) The carrying value of the Senior Notes was reduced by the net debt issuance costs of $10.6 million and $5.2 million at September 30, 2020 and 2019, respectively.
Future Principal Payments For the Senior Notes
Future principal payments for the Senior Notes are as follows (in thousands):
Year Ending September 30,
 
2021
$

2022

2023

2024

2025

Thereafter
750,000

       Total
$
750,000