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Debt (Tables)
12 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
As of September 30, 2019 and 2018, we had the following long-term borrowing obligations:
(in thousands)
September 30,
 
2019
 
2018
6.000% Senior notes due 2024
$
500,000

 
$
500,000

Revolving credit facility
173,125

 
148,125

Total debt
673,125

 
648,125

Unamortized debt issuance costs for the Senior notes (1)
(3,991
)
 
(4,857
)
Total debt, net of issuance costs (2)
$
669,134

 
$
643,268