CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net sales:
Products	$ 157,445	$ 154,168	$ 289,188	$ 298,928
Services	121,141	93,872	237,789	193,482
Total net sales	278,586	248,040	526,977	492,410
Costs and expenses:
Products	117,093	109,403	208,666	214,015
Services	78,457	69,591	164,674	137,435
Selling, general and administrative expenses	63,773	54,644	125,453	113,832
Research and development	14,202	12,858	26,179	21,878
Amortization of purchased intangibles	6,484	7,265	13,835	15,691
Restructuring costs	256	363	1,751	1,266
Total costs and expenses	280,265	254,124	540,558	504,117
Operating loss	(1,679)	(6,084)	(13,581)	(11,707)
Other income (expense):
Interest and dividend income	625	214	1,107	440
Interest expense	(2,911)	(4,305)	(5,585)	(7,845)
Other income (expense), net	2,028	(399)	1,950	(948)
Loss from continuing operations before income taxes	(1,937)	(10,574)	(16,109)	(20,060)
Income tax provision (benefit)	1,409	(52,445)	(1,328)	(62,947)
Net income (loss) from continuing operations	(3,346)	41,871	(14,781)	42,887
Net income (loss) from discontinued operations	1,335	(41,410)	2,984	(45,294)
Net income (loss)	$ (2,011)	$ 461	$ (11,797)	$ (2,407)
Basic
Continuing operations (in dollars per share)	$ (0.12)	$ 1.54	$ (0.54)	$ 1.58
Discontinued operations (in dollars per share)	0.05	(1.53)	0.11	(1.67)
Basic earnings per share (in dollars per share)	(0.07)	0.02	(0.43)	(0.09)
Diluted
Continuing operations (in dollars per share)	(0.12)	1.54	(0.54)	1.58
Discontinued operations (in dollars per share)	0.05	(1.53)	0.11	(1.67)
Diluted earnings per share (in dollars per share)	(0.07)	0.02	(0.43)	(0.09)
Dividends per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Weighted average shares used in per share calculations:
Basic (in shares)	27,223	27,103	27,215	27,095
Diluted (in shares)	27,223	27,159	27,215	27,095
Continuing operations
Weighted average shares used in per share calculations:
Basic (in shares)	27,223	27,103	27,215	27,095
Diluted (in shares)	27,223	27,159	27,215	27,132
Discontinued operations
Weighted average shares used in per share calculations:
Basic (in shares)	27,223	27,103	27,215	27,095
Diluted (in shares)	27,326	27,103	27,298	27,095