Restructuring Charges (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs		$ 53,100,000	$ 36,000,000.0	$ 17,100,000
Selling, general and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses		3,500,000	0	200,000
Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		15
Restructuring Charges, Including Amounts in COGS		3.5
Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Including Amounts in COGS	$ 0.2
Operating Model Redesign | Selling, general and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses		1.7	$ 0.1	$ 0.3
Asset impairment and accelerated depreciation | Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		2
Other exit costs | Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		13
Other exit costs | Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		$ 11