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Senior Notes (Tables)
12 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Senior Notes
The 2008 Senior Notes were issued in four series as follows:        
Series
Amount
Interest Rate
Maturity Date
 
(In millions)
 
 
A
$
41.0

6.37
%
May 7, 2013
B
$
40.0

6.37
%
May 7, 2015
C
$
63.0

6.71
%
May 7, 2015
D
$
131.0

7.18
%
May 7, 2018
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, 2018 and 2017: 
 
September 30, 2018

September 30, 2017
 
Carrying
Amounts (1)

Fair Value

Carrying
Amounts (1)

Fair Value
 
(In thousands)
The 2008 Senior Notes
$


$


$
131,000


$
134,250

The 2010 Senior Notes
113,000


114,413


113,000


119,106

The 2018 Senior Notes
400,000

 
404,000

 

 

      Total
$
513,000

 
$
518,413

 
$
244,000

 
$
253,356

Future Principal Payments For the Senior Notes
Future principal payments for the Senior Notes are as follows (in thousands):                
Year Ending September 30,
 
2019
$
28,000

2020
85,000

2021

2022

2023

Thereafter
400,000

       Total
$
513,000