Segment Information (Financial Information For Each Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 39,205	$ 29,158	$ 114,968	$ 89,923
Operating income (loss)	9,249	7,832	26,951	27,839
Depreciation and amortization	2,722	2,146	7,752	5,750
Capital expenditures for property, plant & equipment	4,118	3,974	11,476	9,627
Radiation Measurement [Member]
Revenues	26,926	23,860	81,328	75,291
Operating income (loss)	6,813	7,790	21,132	28,449
Depreciation and amortization	1,803	1,905	5,415	5,077
Capital expenditures for property, plant & equipment	3,949	3,786	10,986	9,152
Medical Physics [Member]
Revenues	8,064	5,298	23,186	14,632
Operating income (loss)	517	42	1,519	(610)
Depreciation and amortization	395	241	1,029	673
Capital expenditures for property, plant & equipment	137	188	449	475
Medical Products [Member]
Revenues	4,215	0	10,454	0
Operating income (loss)	1,919	0	4,300	0
Depreciation and amortization	524	0	1,308	0
Capital expenditures for property, plant & equipment	$ 32	$ 0	$ 41	$ 0