Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Revenues	$ 36,580	$ 39,205	$ 110,343	$ 114,968
Operating income (loss)	(16,776)	9,249	(2,895)	26,951
Consolidated Assets	270,857		270,857		302,125
Radiation Measurement [Member]
Revenues	26,383	26,926	80,035	81,328
Operating income (loss)	4,759	6,813	16,142	21,132
Consolidated Assets	163,001		163,001		171,831
Medical Physics [Member]
Revenues	7,903	8,064	23,090	23,186
Operating income (loss)	1,056	517	2,580	1,519
Consolidated Assets	35,784		35,784		36,304
Medical Products [Member]
Revenues	2,294	4,215	7,218	10,454
Operating income (loss)	(22,591)	1,919	(21,617)	4,300
Consolidated Assets	$ 72,072		$ 72,072		$ 93,990