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Property, Plant and Equipment
 12 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at September 30, 2024 and 2023 consisted of the following (in thousands):
September 30,
20242023
Construction equipment$570,044 $447,467 
Plants255,214 208,708 
Land and improvements94,182 76,396 
Mineral reserves 69,334 69,405 
Buildings39,838 36,885 
Furniture and fixtures8,616 7,538 
Leasehold improvements1,268 1,268 
Total property, plant and equipment, gross1,038,496 847,667 
Accumulated depreciation, depletion and amortization(426,842)(358,462)
Construction in progress18,270 15,890 
Total property, plant and equipment, net$629,924 $505,095 
Depreciation, depletion and amortization expense related to property, plant and equipment for the fiscal years ended September 30, 2024, 2023 and 2022 was $92.6 million, $80.0 million and $68.9 million, respectively.
Mineral reserves, net of accumulated depletion, as of September 30, 2024 and 2023 were $62.1 million and $63.6 million, respectively. These amounts include $1.4 million and $1.5 million of asset retirement obligation assets, net of accumulated depletion associated with active mining operations as of September 30, 2024 and 2023, respectively, and $1.7 million and $0.8 million of capitalized stripping costs, net of accumulated depletion associated with development stage mining operations as of September 30, 2024 and 2023, respectively.