Basis of Presentation and Major Accounting Policies (Narrative) (Details)	12 Months Ended
	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | segment	5
Assets of discontinued operations	$ 0	$ 0
Liabilities of discontinued operations	0	0
Excluded components recognized within earnings	31,400,000	25,100,000	$ 23,200,000
Environmental expenditures	$ 27,000,000.0	$ 24,900,000	$ 22,300,000
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Pre-tax loss from discontinued operations	$ 19,400,000
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, residual value	$ 0
Computer software costs | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer software costs | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	5 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	25 years
Patents and technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	5 years
Patents and technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	15 years
Land Use Rights
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	50 years