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Senior Notes (Tables)
 6 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Carrying Amounts and Fair Values of Senior Notes
The following table presents the carrying amounts and fair values for the Senior Notes at March 31, 2017 and September 30, 2016:
 
March 31, 2017
 
September 30, 2016
 
Carrying
Amounts
 
Fair Value
 
Carrying
Amounts (1)
 
Fair Value (1)
 
(In thousands)
The 2008 Senior Notes
$
131,000

 
$
136,675

 
$
131,000

 
$
139,902

The 2010 Senior Notes
185,000

 
191,669

 
185,000

 
195,715

Debt issuance costs
(280
)
 
(280
)
 
(376
)
 
(376
)
       Total
$
315,720

 
$
328,064

 
$
315,624

 
$
335,241

(1) Balances as of September 30, 2016 have been recast as a result of the adoption of ASU 2015-03 to present debt issuance costs of $0.4 million as a direct deduction from the carrying amount of the Senior Notes.