Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment

v3.23.3
Property, Plant and Equipment
 12 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at September 30, 2023 and 2022 consisted of the following (in thousands):
September 30,
2023 2022
Construction equipment $ 447,467  $ 402,581 
Plants 208,708  167,625 
Land and improvements 76,396  59,454 
Mineral reserves 69,405  91,992 
Buildings 36,885  32,566 
Furniture and fixtures 7,538  7,110 
Leasehold improvements 1,268  1,230 
Total property, plant and equipment, gross 847,667  762,558 
Accumulated depreciation, depletion and amortization (358,462) (304,935)
Construction in progress 15,890  23,789 
Total property, plant and equipment, net $ 505,095  $ 481,412 
Depreciation, depletion and amortization expense related to property, plant and equipment for the fiscal years ended September 30, 2023, 2022 and 2021 was $80.0 million, $68.9 million and $49.5 million, respectively.
Mineral reserves, net of accumulated depletion, for the years ended September 30, 2023 and 2022 were $63.6 million and $87.6 million, respectively. These amounts include $1.5 million and $2.0 million of asset retirement obligation assets, net of accumulated depletion associated with active mining operations for the years ended September 30, 2023 and 2022, respectively, and $0.8 million and $3.9 million of capitalized stripping costs, net of accumulated depletion associated with development stage mining operations for the fiscal years ended September 30, 2023 and 2022, respectively.