Organization (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($) employee business_segments
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments | business_segments	2
Entity Number of Employees | employee	3,500
Percentage of Employees Covered by Collective Bargaining Agreements	0.42
Proceeds From Other Equity, Gross Amount	$ 4.8
Intercompany Loan Related to NMTC	12.2
Investment Fund Contribution For NMTC	16.5
Sub CDE Loan From NMTC	16.2
Other Sundry Liabilities, Noncurrent	$ 3.9