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, 2024
Sep. 30, 2023
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 939,958 $ 847,667
Accumulated depreciation, depletion and amortization (391,453) (358,462)
Construction in progress 16,846 15,890
Total property, plant and equipment, net 565,351 505,095
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 511,111 447,467
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 233,611 208,708
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 79,903 76,396
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 69,405 69,405
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 36,885 36,885
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 7,775 7,538
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,268 $ 1,268