Goodwill And Intangible Assets (Changes In The Carrying Amount Of Goodwill, By Reportable Segment) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill	$ 104,918	$ 107,286
Accumulated goodwill impairment	(64,068)	(64,068)
Goodwill	40,850	43,218
Effects of foreign currency	(2,368)
Radiation Measurement [Member]
Goodwill [Line Items]
Goodwill	16,799	18,961
Goodwill	16,799	18,961
Effects of foreign currency	(2,162)
Medical Physics [Member]
Goodwill [Line Items]
Goodwill	22,611	22,611
Goodwill	22,611	22,611
Medical Products [Member]
Goodwill [Line Items]
Goodwill	65,508	65,714
Accumulated goodwill impairment	(64,068)	(64,068)
Goodwill	1,440	$ 1,646
Effects of foreign currency	$ (206)