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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following:
September 30,
20202019
Land$36,775 $36,276 
Buildings166,907 142,585 
Machinery and equipment280,432 257,706 
Vehicles18,719 13,497 
Furniture and fixtures9,865 9,615 
Information systems56,573 46,516 
Finance leases2,514 1,200 
Construction in progress123,441 63,636 
Total property, plant and equipment695,226 571,031 
Less: accumulated depreciation(333,159)(294,213)
Net property, plant and equipment$362,067 $276,818 
Depreciation expense was $39,929, $37,584 and $17,255 for the years ended September 30, 2020, 2019 and 2018, respectively.
In fiscal 2020 and 2019, we recorded impairment charges of $450 and $4,063, respectively, of property, plant and equipment related to the wood treatment asset group, and adjusted the remaining useful lives such that they do not extend beyond the announced plant closures around the end of the calendar year 2021. See Note 10 of this Annual Report on Form 10-K for further information. We did not record any impairment expense on property, plant and equipment in fiscal 2018.