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Senior Notes (Tables)
12 Months Ended
Sep. 30, 2019
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, 2019 and 2018: 
 
September 30, 2019

September 30, 2018
 
Carrying
Amounts (1)

Fair Value

Carrying
Amounts (1)

Fair Value
 
(In thousands)
The 2010 Senior Notes
$
85,000


$
86,121


$
113,000


$
114,413

The 2018 Senior Notes
400,000

 
428,000

 
400,000

 
404,000

      Total
$
485,000

 
$
514,121

 
$
513,000

 
$
518,413

Future Principal Payments For the Senior Notes
Future principal payments for the Senior Notes are as follows (in thousands):
    
Year Ending September 30,
 
2020
$
85,000

2021

2022

2023

2024

Thereafter
400,000

       Total
$
485,000