Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 104,680	$ 152,266	$ 215,021	$ 302,243
Cost of goods sold	88,858	122,172	184,200	248,999
Gross profit	15,822	30,094	30,821	53,244
Selling, general and administrative expenses	15,994	19,024	31,692	38,425
Research and development expenses	1,623	1,959	3,092	3,813
Amortization of intangible assets	88	86	176	174
Restructuring and separation costs	840	3,259	840	7,056
Operating income (loss)	(2,723)	5,766	(4,979)	3,776
Other income	(507)	(507)	(1,015)	(1,015)
Interest expense	47	50	81	74
Interest income	(89)	(71)	(131)	(71)
Income (loss) before income taxes	(2,174)	6,294	(3,914)	4,788
Income tax provision (benefit)	(1,345)	727	(2,786)	(320)
Net income (loss)	$ (829)	$ 5,567	$ (1,128)	$ 5,108
Income (loss) per share:
Basic (in dollars per share)	$ (0.07)	$ 0.49	$ (0.10)	$ 0.45
Diluted (in dollars per share)	$ (0.07)	$ 0.49	$ (0.10)	$ 0.45
Weighted average shares:
Basic (in shares)	11,445	11,369	11,441	11,382
Diluted (in shares)	11,445	11,422	11,441	11,415
Dividends per share (in dollars per share)	$ 0.26	$ 0.26	$ 0.52	$ 0.52