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, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at December 31, 2021 and September 30, 2021 consisted of the following (in thousands):
December 31, 2021 September 30, 2021
(unaudited)
Construction equipment $ 357,051  $ 333,966 
Plants 149,441  143,172 
Mineral reserves 86,827  86,556 
Land and improvements 57,096  53,415 
Buildings 27,463  27,163 
Furniture and fixtures 6,539  6,426 
Leasehold improvements 1,230  1,230 
      Total property, plant and equipment, gross 685,647  651,928 
Accumulated depreciation, depletion, and amortization (263,938) (250,803)
Construction in progress 7,256  3,707 
      Total property, plant and equipment, net $ 428,965  $ 404,832 
Depreciation, depletion, and amortization expense related to property, plant and equipment for the three months ended December 31, 2021 and 2020 was $15.8 million and $11.0 million, respectively.