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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 consists of the following:
September 30, 2021September 30, 2020
Machinery and equipment$388,352 $357,650 
Rental equipment246,257 221,953 
Land and buildings70,048 70,245 
Construction in process
59,737 48,325 
$764,394 $698,173 
Less: accumulated depreciation
(389,406)(333,712)
Property, plant, and equipment, net
$374,988 $364,461 
The Company entered into secured financing agreements that require providing a security interest in specified equipment. As of September 30, 2021 and September 30, 2020, the gross and net amounts of those assets are as follows:
September 30, 2021September 30, 2020
Gross
Net
Gross
Net
Machinery and equipment$89,115 $72,666 $63,305 $52,620 
Construction in process
30,504 30,504 8,098 8,098 
$119,619 $103,170 $71,403 $60,718 
Depreciation expense and maintenance and repairs expense for the years ended September 30, 2021, 2020 and 2019 were as follows:
Year Ended September 30,
202120202019
Depreciation expense $76,279 $73,002 $66,031 
Maintenance and repair expense $22,354 $20,303 $23,861