Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014		Mar. 31, 2015	Mar. 31, 2014		Sep. 30, 2014
Segment Reporting Information [Line Items]
Consolidated revenues	$ 38,139	$ 39,054	[1]	$ 75,686	$ 77,201	[1]
Consolidated operating income	5,630	6,863	[1]	11,771	12,288	[1]
Consolidated Assets	208,957			208,957			216,586
Radiation Measurement [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	27,246	28,684	[1]	53,737	56,867	[1]
Consolidated operating income	9,414	9,800	[1]	18,798	18,629	[1]
Consolidated Assets	144,505			144,505			148,151
Medical Physics [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	8,561	8,029	[1]	17,045	15,768	[1]
Consolidated operating income	321	599	[1]	939	1,032	[1]
Consolidated Assets	39,860			39,860			38,851
Medical Products [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	2,332	2,341	[1]	4,904	4,566	[1]
Consolidated operating income	244	(174)	[1]	578	(462)	[1]
Consolidated Assets	48,192			48,192			48,164
Eliminations [Member]
Segment Reporting Information [Line Items]
Consolidated Assets	(23,600)			(23,600)			(18,580)
Corporate [Member]
Segment Reporting Information [Line Items]
Consolidated operating income	$ (4,349)	$ (3,362)	[1]	$ (8,544)	$ (6,911)	[1]

[1] As Restated