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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 179.2 $ 160.3 $ 89.2 $ 146.5
Inventories:        
Purchased components and raw material 172.6 176.9    
Work in process 66.8 60.0    
Finished goods 67.9 61.0    
Inventories, net 307.3 297.9    
Prepaid Expense and Other Assets, Current [Abstract]        
Prepaid Expense 17.4 17.8    
Nontrade Receivables 1.6 1.7    
Maintenance and repair tooling 5.2 4.1    
Income taxes 0.8 0.8    
Nontrade Receivables, Current 2.0 2.2    
Other 5.4 4.9    
Other 32.4 31.5    
Property, plant and equipment:        
Land 6.4 6.4    
Buildings 120.6 117.2    
Machinery and equipment 529.0 525.8    
Construction in progress 43.7 36.9    
Property, plant and equipment, gross 699.7 686.3    
Accumulated depreciation (390.6) (374.6)    
Property, plant and equipment net 309.1 311.7    
Other Assets, Noncurrent [Abstract]        
Operating lease, Right-of-Use asset 28.2 23.6    
us-Maintenance, repair and tooling supplies 20.7 21.1    
Nontrade Receivables, Noncurrent 3.3 2.4    
Assets for Plan Benefits, Defined Benefit Plan 5.8 6.6    
Other Receivables 1.8 1.8    
Debt Issuance Costs, Noncurrent, Net 1.4 0.7    
Other Assets, Miscellaneous, Noncurrent 1.2 2.6    
Other noncurrent assets $ 62.4 $ 58.8