Quarterly report [Sections 13 or 15(d)]

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

v3.25.2
Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,624,121 $ 1,038,496
Accumulated depreciation, depletion and amortization (502,329) (426,842)
Construction in progress 25,821 18,270
Total property, plant and equipment, net 1,147,613 629,924
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 755,626 570,044
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 394,522 255,214
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 221,095 69,334
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 188,149 94,182
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 53,984 39,838
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 9,314 8,616
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,431 $ 1,268