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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]    
Accounts payable $ 8,759 $ 9,515
Accrued compensation and benefits 22,022 16,612
Other accrued expenses 15,836 11,354
Accounts payable and accrued expenses, total $ 46,617 $ 37,481