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Property, Plant, and Equipment (Tables)
 3 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Estimated useful lives for major classes of depreciable assets are as follows:
Asset Class
Estimated Useful Life
Machinery and equipment
3 to 20 years
Buildings and improvements
10 to 40 years
Property, plant, and equipment consists of the following:
 
December 31,
2019
 
September 30,
2019
Machinery and equipment
$
332,109

 
$
316,390

Rental equipment
178,069

 
172,534

Land and buildings
64,761

 
64,165

Construction in process
44,516

 
40,599

 
619,455

 
593,688

Less: accumulated depreciation
(280,320
)
 
(260,104
)
 
$
339,135

 
$
333,584

Depreciation expense and maintenance and repairs expense for the three months ended December 31, 2019 and 2018 were as follows:
 
Three Months Ended
December 31,
 
2019
 
2018
Depreciation expense
$
17,303

 
$
15,209

Maintenance and repair expense
6,065

 
6,157
Schedule of Financial Instruments Owned and Pledged as Collateral
 
December 31,
2019
 
September 30,
2019
 
Gross
 
Net
 
Gross
 
Net
Machinery and equipment
$
52,395

 
$
45,333

 
$
48,288

 
$
42,162

Construction in process
1,494

 
1,494

 
2,531

 
2,531

 
$
53,889

 
$
46,827

 
$
50,819

 
$
44,693