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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 329.2 $ 309.9 $ 179.2 $ 160.3
Inventories:        
Purchased components and raw material 164.3 163.6    
Work in process 67.0 65.8    
Finished goods 74.2 72.3    
Inventories, net 305.5 301.7    
Prepaid Expense and Other Assets, Current [Abstract]        
Prepaid Expense 20.5 17.2    
Nontrade Receivables 3.1 3.4    
Maintenance and repair tooling 3.8 5.4    
Other Inventory, Gross 3.2 4.2    
Income taxes 0.8 0.8    
Nontrade Receivables, Current 2.4 2.4    
Other 6.9 4.5    
Other 40.7 37.9    
Property, plant and equipment:        
Land 6.5 6.5    
Buildings 130.1 126.6    
Machinery and equipment 562.7 550.4    
Construction in progress 52.1 45.2    
Property, plant and equipment, gross 751.4 728.7    
Accumulated depreciation (426.6) (409.9)    
Property, plant and equipment net 324.8 318.8    
Other Assets, Noncurrent [Abstract]        
Operating lease, Right-of-Use asset 26.6 26.9    
us-Maintenance, repair and tooling supplies 19.2 20.3    
Nontrade Receivables, Noncurrent 4.1 4.1    
Assets for Plan Benefits, Defined Benefit Plan 14.4 13.5    
Other Receivables 1.8 1.8    
Debt Issuance Costs, Noncurrent, Net 1.1 1.3    
Other Assets, Miscellaneous, Noncurrent 0.4 0.4    
Other noncurrent assets $ 67.6 $ 68.3