Equity (Schedule of Stock-based Compensation Expense - by Award Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,606	$ 3,648	$ 3,602
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	25	32	45
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,495	1,742	1,643
Performance stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	685	1,343	1,367
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	180	276	300
Outside director equity awards and fees in common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 221	$ 255	$ 247