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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Sep. 30, 2019
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, 2017$44,257  10,122  —  $54,379  
Year ended September 30, 201854,379  (15,042) —  39,337  
Year ended September 30, 2019$39,337  2,572  —  $41,909  
Allowance for doubtful accounts (deducted from accounts receivable)    
Year ended September 30, 2017$718  357  (407) $668  
Year ended September 30, 2018668  199  (530) 337  
Year ended September 30, 2019$337  178  (224) $291  
Provision for Inventory allowance (deducted from inventory)    
Year ended September 30, 2017$3,446  10,381  (9,255) $4,572  
Year ended September 30, 20184,572  2,494  (6,563) 503  
Year ended September 30, 2019$503  331  (503) $331