Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon		2000.00%
Gain (loss) on corridor		10.00%
Defined Benefit Plan, Amortization of Gain (Loss)		$ (2.2)	$ (3.1)	$ (3.7)
Defined Contribution Plan, Cost		$ 10.0	$ 9.1	$ 8.2
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Gain (Loss)	$ (0.7)