Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Details)

v3.21.2
Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 651,928 $ 441,491
Accumulated depreciation, depletion and amortization (250,803) (209,532)
Construction in progress 3,707 5,271
Total property, plant and equipment, net 404,832 237,230
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 333,966 253,157
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 143,172 102,392
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 53,415 38,647
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 86,556 22,205
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 27,163 18,307
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 6,426 5,648
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,230 $ 1,135