Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details)

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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,446,909 $ 1,038,496
Accumulated depreciation, depletion, and amortization (453,718) (426,842)
Construction in progress 37,701 18,270
Total property, plant and equipment, net 1,030,892 629,924
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 660,113 570,044
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 338,228 255,214
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 175,427 94,182
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 220,915 69,334
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 42,233 39,838
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 8,686 8,616
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,307 $ 1,268