Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment

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Property, Plant and Equipment
 3 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at December 31, 2023 and September 30, 2023 consisted of the following (in thousands):
December 31, 2023 September 30, 2023
(unaudited)
Construction equipment $ 499,339  $ 447,467 
Plants 225,125  208,708 
Land and improvements 78,275  76,396 
Mineral reserves 69,405  69,405 
Buildings 36,885  36,885 
Furniture and fixtures 7,608  7,538 
Leasehold improvements 1,268  1,268 
      Total property, plant and equipment, gross 917,905  847,667 
Accumulated depreciation, depletion, and amortization (374,743) (358,462)
Construction in progress 18,499  15,890 
      Total property, plant and equipment, net $ 561,661  $ 505,095 
Depreciation, depletion, and amortization expense related to property, plant and equipment for the three months ended December 31, 2023 and 2022 was $21.0 million and $19.3 million, respectively.