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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]      
Minimum payments for leases not yet commenced $ 1,964    
Other Commitment 2,422    
Operating Leases, Rent Expense 10,553 $ 7,680 $ 6,990
Operating Leases, Future Minimum Payments Due, Next Twelve Months 8,101    
Operating Leases, Future Minimum Payments Receivable, in Two Years 6,235    
Operating Leases, Future Minimum Payments Receivable, in Three Years 4,750    
Operating Leases, Future Minimum Payments Receivable, in Four Years 3,139    
Operating Leases, Future Minimum Payments Receivable, in Five Years 2,130    
Operating Leases, Future Minimum Payments Receivable, Thereafter 3,595    
Operating Leases, Future Minimum Payments Due $ 27,950