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Property, Plant, and Equipment
 3 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at December 31, 2022 and September 30, 2022 consisted of the following (in thousands):
December 31, 2022September 30, 2022
(unaudited)
Construction equipment$437,627 $402,581 
Plants181,368 167,625 
Mineral reserves69,466 91,992 
Land and improvements65,517 59,454 
Buildings35,184 32,566 
Furniture and fixtures7,172 7,110 
Leasehold improvements1,230 1,230 
      Total property, plant and equipment, gross797,564 762,558 
Accumulated depreciation, depletion, and amortization(322,300)(304,935)
Construction in progress23,029 23,789 
      Total property, plant and equipment, net$498,293 $481,412 
Depreciation, depletion, and amortization expense related to property, plant and equipment for the three months ended December 31, 2022 and 2021 was $19.3 million and $15.8 million, respectively.