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, 2020
Sep. 30, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 436,354 $ 383,279
Accumulated depreciation, depletion and amortization (202,141) (177,927)
Construction in progress 2,538 518
Total property, plant and equipment, net 236,751 205,870
Construction equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 250,249 214,500
Plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 100,854 92,279
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 40,479 34,365
Quarry reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 20,371 20,678
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 18,001 15,458
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 5,265 4,864
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 1,135 $ 1,135