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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Product Warranty Expense $ 14,800,000 $ 9,500,000 $ 3,500,000
Asset Retirement Obligation 4,200,000    
Exposure to Workers Compensation Claims, Per Incident 800,000    
Workers' Compensation Liability $ 9,900,000 $ 11,100,000  
Income Tax Benefit, Likelihood of Realization Threshold 50.00%    
Debt Issuance Costs, Net $ 4,600,000    
Minimum [Member]      
Finite-Lived Tangible Asset, Useful Life, Maximum   3 years  
Maximum [Member]      
Finite-Lived Tangible Asset, Useful Life, Maximum   10 years  
Land Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 10 years    
Land Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 20 years    
Building [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 10 years    
Building [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 40 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 3 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 20 years    
Software and Software Development Costs [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life, Minimum 6 years    
U.S. Pipe [Member] | Maximum [Member]      
Discontinued Operations, Receivable from Buyer of Discontinued Operation $ 4,600,000 $ 5,900,000  
Revolving Credit Facility [Member]      
Debt Issuance Costs, Net 500,000    
Unsecured Debt [Member]      
Debt Issuance Costs, Net 3,900,000 $ 4,700,000  
Debt      
Debt Issuance Costs, Net $ 200,000