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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Property Plant And Equipment [Abstract]    
Land and land improvements $ 7,933 $ 8,552
Building and building improvements 24,582 31,070
Machinery and equipment 54,760 52,523
Furniture and fixtures 1,376 1,362
Tools and molds 2,710 2,256
Construction in progress 512 503
Leasehold improvements 85  
Transportation equipment 75 31
Property plant and equipment gross 92,033 96,297
Accumulated depreciation and impairment (60,559) (62,673)
Property plant and equipment net $ 31,474 $ 33,624