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Debt - Schedule of Debt (Tables)
12 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company's notes payable at their carrying amounts consist of the following:
September 30,
 20242023
 (In millions)
Unsecured:
Revolving credit facility$— $— 
3.85% senior notes due 2026 (1)
398.4 397.4 
5.0% senior notes due 2028 (1)
298.1 297.6 
Other note payable9.9 — 
$706.4 $695.0 
______________
(1)Unamortized debt issuance costs that were deducted from the carrying amounts of the senior notes totaled $3.5 million and $5.0 million at September 30, 2024 and 2023, respectively.