Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Details)

v3.10.0.1
Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]    
Depreciation, depletion and amortization expense $ 24,800 $ 20,800
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 338,118 263,983
Accumulated depreciation, depletion and amortization (160,795) (148,072)
Construction in progress 1,369 0
Total property, plant and equipment, net 178,692 115,911
Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 190,420 154,911
Asphalt plants    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 79,563 66,379
Land and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 29,624 20,991
Quarry reserves    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 20,908 7,219
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 12,416 9,848
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross 4,422 3,870
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, gross $ 765 $ 765