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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Activity in valuation and qualifying accounts      
Balance at beginning of period $ 300    
Balance at end of period 200 $ 300  
Deferred tax valuation allowance (deducted from net deferred tax assets)      
Activity in valuation and qualifying accounts      
Balance at beginning of period 41,788 41,909 $ 39,337
Charged (credited) to expense (27,975) (121) 2,572
Reductions 0 0 0
Balance at end of period 13,813 41,788 41,909
Allowance for doubtful accounts (deducted from accounts receivable)      
Activity in valuation and qualifying accounts      
Balance at beginning of period 389 291 337
Charged (credited) to expense 297 200 178
Reductions (196) (102) (224)
Balance at end of period 490 389 291
Provision for inventory allowance (deducted from inventory)      
Activity in valuation and qualifying accounts      
Balance at beginning of period 300 331 503
Charged (credited) to expense 174 328 331
Reductions (300) (359) (503)
Balance at end of period $ 174 $ 300 $ 331