Detail of Certain Balance Sheet Accounts - Other Non Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Other Assets, Noncurrent [Abstract]
Deferred Compensation Plan Assets	$ 747	$ 641
Investments	558	558
Other, Other Noncurrent Assets	4,760	2,583
Other Assets, Noncurrent, Total	$ 6,065	$ 3,782