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
Jun. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 816,880 $ 762,558
Accumulated depreciation, depletion and amortization (349,289) (304,935)
Construction in progress 35,141 23,789
Total property, plant and equipment, net 502,732 481,412
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 448,736 402,581
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 187,514 167,625
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 69,405 91,992
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 69,892 59,454
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 32,682 32,566
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 7,383 7,110
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,268 $ 1,230