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Property, Plant and Equipment
 12 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following:
September 30,
20212020
Land and land improvements$37,421 $36,775 
Buildings195,252 166,907 
Machinery and equipment352,014 280,432 
Vehicles20,075 18,719 
Furniture and fixtures10,045 9,865 
Information systems66,723 56,573 
Finance leases2,442 2,514 
Construction in progress43,542 123,441 
Total property, plant and equipment727,514 695,226 
Less: accumulated depreciation(372,743)(333,159)
Net property, plant and equipment$354,771 $362,067 
Depreciation expense was $48,210, $39,929 and $37,584 for the years ended September 30, 2021, 2020 and 2019, respectively