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Property, Plant and Equipment
 12 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
12. PROPERTY, PLANT AND EQUIPMENT

As of September 30, 2018 and September 30, 2017, property, plant and equipment at cost and accumulated depreciation were as follows:
(in thousands)
September 30, 2018
 
September 30, 2017
Land
$
13,295

 
$
13,296

Buildings and related improvements
108,758

 
105,154

Machinery and equipment
262,078

 
248,440

Leasehold improvements
7,382

 
6,744

Software
30,502

 
15,135

Construction in progress
16,777

 
16,160

Property, plant and equipment
438,792

 
404,929

Accumulated depreciation
(225,684
)
 
(196,310
)
Property, plant and equipment, net
$
213,108

 
$
208,619


    
Depreciation expense for fiscal years ended September 30, 2018, September 30, 2017 and September 30, 2016 totaled $34,786, $32,320 and $32,779, respectively.