Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 152,266	$ 170,199	$ 302,243	$ 322,800
Cost of goods sold	122,172	145,898	248,999	277,430
Gross profit	30,094	24,301	53,244	45,370
Selling, general and administrative expenses	19,024	19,464	38,425	40,279
Research and development expenses	1,959	1,626	3,813	3,466
Amortization of intangible assets	86	113	174	232
Restructuring and separation expenses	3,259	1,332	7,056	1,332
Operating income	5,766	1,766	3,776	61
Other income	(507)	(879)	(1,015)	(1,386)
Interest expense	50	33	74	69
Interest income	(71)	(84)	(71)	(88)
Income before income taxes	6,294	2,696	4,788	1,466
Income tax provision (benefit)	727	6,379	(320)	5,388
Net income (loss)	$ 5,567	$ (3,683)	$ 5,108	$ (3,922)
Income (loss) per share:
Basic	$ 0.49	$ (0.31)	$ 0.45	$ (0.33)
Diluted	$ 0.49	$ (0.31)	$ 0.45	$ (0.33)
Weighted average shares:
Basic	11,369	12,018	11,382	12,029
Diluted	11,422	12,018	11,415	12,029
Dividends per share	$ 0.26	$ 0.26	$ 0.52	$ 0.52