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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
(Dollars in Thousands)
Balance at
beginning
of period		Charged
(credited) to
expense		ReductionsBalance at
end of
period
Deferred tax valuation allowance (deducted from net deferred tax assets)    
Year ended September 30, 2019$39,337 2,572 — $41,909 
Year ended September 30, 202041,909 (121)— 41,788 
Year ended September 30, 2021$41,788 (27,975)— $13,813 
Allowance for doubtful accounts (deducted from accounts receivable)    
Year ended September 30, 2019$337 178 (224)$291 
Year ended September 30, 2020291 200 (102)389 
Year ended September 30, 2021$389 297 (196)$490 
Provision for inventory allowance (deducted from inventory)    
Year ended September 30, 2019$503 331 (503)$331 
Year ended September 30, 2020331 328 (359)300 
Year ended September 30, 2021$300 174 (300)$174