Goodwill And Intangible Assets (Changes In The Carrying Amount Of Goodwill, By Reportable Segment) (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Balance	$ 33,807
Currency translation adjustment	(338)
Balance	33,469
Radiation Measurement [Member]
Goodwill [Line Items]
Balance	11,196
Currency translation adjustment	(338)
Balance	10,858
Medical Physics [Member]
Goodwill [Line Items]
Balance	22,611
Currency translation adjustment
Balance	$ 22,611