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New Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Rent expense for all operating leases $ 7,578 $ 8,348 $ 8,302  
Future minimum rental payments required under operating leases 26,919      
ASU 2016-16 [Member]        
Cumulative effect from adoption (1,005)      
Retained Earnings [Member] | ASU 2016-16 [Member]        
Cumulative effect from adoption $ (1,005)      
Retained Earnings And Other Current Assets [Member] | ASU 2016-16 [Member]        
Cumulative effect from adoption       $ 1,005