CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest in VIE	Total
Balance at Sep. 30, 2017	$ 37,850	$ 794,485	$ (106,626)	$ (36,078)
Balance (in shares) at Sep. 30, 2017						27,127
Increase (Decrease) in Stockholders' Equity
Net loss		(11,797)				$ (11,797)
Other comprehensive loss, net of tax			3,188			$ 3,188
Stock issued under employee stock purchase plans, value	798
Stock issued under employee stock purchase plans (in shares)						14
Purchase of common stock, value	(2,324)
Purchase of common stock (in shares)						(43)
Stock- based compensation	3,755
Stock- based compensation (in shares)						127
Cash dividends paid		(3,676)
Balance at Mar. 31, 2018	40,079	779,012	(103,438)	(36,078)
Balance (in shares) at Mar. 31, 2018						27,225
Balance at Sep. 30, 2018	45,008	801,834	(110,643)	(36,078)	$ 24,075	$ 724,196
Balance (in shares) at Sep. 30, 2018						27,255
Increase (Decrease) in Stockholders' Equity
Net loss		(15,979)			(5,404)	$ (15,979)
Other comprehensive loss, net of tax			487			$ 487
Stock issued under employee stock purchase plans, value	783
Stock issued under employee stock purchase plans (in shares)						15
Purchase of common stock, value	(3,419)
Purchase of common stock (in shares)						(47)
Stock- based compensation	6,358
Stock- based compensation (in shares)						132
Cumulative effect of accounting standard adoption		19,834			4,655
Stock issued under equity offering, value	215,832
Stock issued under equity offering (in shares)						3,795
Cash dividends paid		(4,205)
Other	50	2			(1)
Balance at Mar. 31, 2019	$ 264,612	$ 801,486	$ (110,156)	$ (36,078)	$ 23,325	$ 943,189
Balance (in shares) at Mar. 31, 2019						31,150