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, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 512,308 $ 441,491
Accumulated depreciation, depletion and amortization (231,397) (209,532)
Construction in progress 8,982 5,271
Total property, plant and equipment, net 289,893 237,230
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 291,893 253,157
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 120,571 102,392
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 47,016 38,760
Quarry reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 23,668 22,092
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 22,161 18,307
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 5,864 5,648
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,135 $ 1,135