v3.26.1
Retirement Plan and Other Post-Retirement Benefits (Narrative) (Details)
6 Months Ended
Mar. 31, 2026
USD ($)
Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Company's contributions $ 0
Estimated future contributions in remainder of fiscal year 0
VEBA Trusts  
Defined Benefit Plan Disclosure [Line Items]  
Company's contributions 0
Estimated future contributions in remainder of fiscal year $ 0