Basis of Presentation and Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Trade Accounts Receivable and Accounts Receivable, Other
Allowance for Doubtful Accounts	$ 1,100,000	$ 1,100,000
Property Plant and Equipment
Imapirement loss	$ 0	$ 3,300,000	$ 0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Restructuring Charges	Restructuring Charges	Restructuring Charges
Selling, general and administrative expenses or cost of goods sold
Property Plant and Equipment
Depreciation expense	$ 99,000,000.0	$ 95,900,000	$ 93,200,000