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Inventories
 12 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
The major classes of inventory, net are as follows:
 
September 30, 2020
 
September 30, 2019
Raw materials and supplies
$
78,319

 
$
75,223

Work in progress
15,654

 
14,741

Finished goods and products held for resale
56,435

 
58,223

Costs of unbilled projects
3,438

 
2,347

Reserves for excess and obsolete
(11,467
)
 
(13,370
)
Inventories, net
$
142,379

 
$
137,164


The following is the activity in the reserves for excess and obsolete inventory:
 
Year Ended September 30,
 
2020
 
2019
 
2018
Balance at beginning of period
$
(13,370
)
 
$
(9,313
)
 
$
(10,599
)
Additions charged to expense
(310
)
 
(5,754
)
 
(419
)
Write-offs
2,197

 
1,541

 
104

Foreign currency and other
16

 
156

 
1,601

Balance at end of period
$
(11,467
)
 
$
(13,370
)
 
$
(9,313
)