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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 372.0 $ 309.9 $ 243.3 $ 160.3
Inventories:        
Purchased components and raw material 159.5 163.6    
Work in process 70.3 65.8    
Finished goods 86.8 72.3    
Inventories, net 316.6 301.7    
Prepaid Expense and Other Assets, Current [Abstract]        
Prepaid Expense 20.2 17.2    
Nontrade Receivables 3.9 3.4    
Maintenance and repair tooling 3.6 5.4    
Other Inventory, Gross 3.7 4.2    
Income taxes 0.8 0.8    
Nontrade Receivables, Current 2.7 2.4    
Other 8.9 4.5    
Other 43.8 37.9    
Property, plant and equipment:        
Land 6.5 6.5    
Buildings 131.2 126.6    
Machinery and equipment 580.4 550.4    
Construction in progress 47.2 45.2    
Property, plant and equipment, gross 765.3 728.7    
Accumulated depreciation (437.5) (409.9)    
Property, plant and equipment net 327.8 318.8    
Other Assets, Noncurrent [Abstract]        
Operating lease, Right-of-Use asset 27.1 26.9    
us-Maintenance, repair and tooling supplies 19.8 20.3    
Nontrade Receivables, Noncurrent 4.1 4.1    
Assets for Plan Benefits, Defined Benefit Plan 14.8 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 $ 69.1 $ 68.3