Quarterly report [Sections 13 or 15(d)]

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

v3.25.1
Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,545,177 $ 1,038,496
Accumulated depreciation, depletion and amortization (478,255) (426,842)
Construction in progress 36,470 18,270
Total property, plant and equipment, net 1,103,392 629,924
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 707,351 570,044
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 378,462 255,214
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 220,915 69,334
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 181,416 94,182
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 46,822 39,838
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 8,780 8,616
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,431 $ 1,268