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, 2022
Sep. 30, 2021
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 716,507 $ 651,928
Accumulated depreciation, depletion and amortization (275,953) (250,803)
Construction in progress 14,076 3,707
Total property, plant and equipment, net 454,630 404,832
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 377,311 333,966
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 153,140 143,172
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 86,920 86,556
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 61,547 53,415
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 29,720 27,163
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 6,639 6,426
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,230 $ 1,230