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
Mar. 31, 2023
Sep. 30, 2022
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 808,837 $ 762,558
Accumulated depreciation, depletion and amortization (336,220) (304,935)
Construction in progress 30,368 23,789
Total property, plant and equipment, net 502,985 481,412
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 444,027 402,581
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 182,917 167,625
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 69,466 91,992
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 70,038 59,454
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 33,656 32,566
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 7,476 7,110
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,257 $ 1,230