Segment Information (Financial Information For Each Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 36,773	$ 37,854	$ 38,082	$ 36,530	$ 40,161	$ 35,467	$ 38,139	$ 37,547	$ 149,239	$ 151,314	$ 155,062
Operating income (loss)	$ 5,459	$ 7,713	$ 7,217	$ 6,252	$ 6,817	$ 5,111	$ 5,630	$ 6,141	26,641	23,699	(39,987)
Depreciation and amortization									11,072	12,312	13,915
Goodwill and other intangible assets impairment charge											62,188
Radiation Measurement [Member]
Segment Reporting Information [Line Items]
Revenues									104,203	105,978	113,556
Operating income (loss)									37,853	35,641	38,231
Depreciation and amortization									9,560	10,345	10,250
Medical Physics [Member]
Segment Reporting Information [Line Items]
Revenues									39,234	35,449	32,213
Operating income (loss)									3,201	3,126	1,827
Depreciation and amortization									1,038	1,089	1,085
Goodwill and other intangible assets impairment charge											62,200
Medical Products [Member]
Segment Reporting Information [Line Items]
Revenues									5,802	9,887	9,293
Operating income (loss)									1,063	1,534	(62,572)
Depreciation and amortization									474	878	2,580
Goodwill and other intangible assets impairment charge											62,188
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									$ (15,476)	$ (16,602)	$ (17,473)