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Debt - Schedule of Debt (Tables)
9 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company's notes payable at their carrying amounts consist of the following:
 June 30, 2024September 30, 2023
 (In millions)
Unsecured:
Revolving credit facility$— $— 
3.85% senior notes due 2026 (1)
398.2 397.4 
5.0% senior notes due 2028 (1)
298.0 297.6 
Other note payable9.9 — 
$706.1 $695.0 
______________
(1)Unamortized debt issuance costs that were deducted from the carrying amounts of the senior notes totaled $3.8 million and $5.0 million at June 30, 2024 and September 30, 2023, respectively.