Goodwill And Intangible Assets (Changes In The Carrying Amount Of Goodwill, By Reportable Segment) (Details) $ in Thousands	3 Months Ended
Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Balance	$ 33,807
Effects of foreign currency - Goodwill	(472)
Balance	33,335
Radiation Measurement [Member]
Goodwill [Line Items]
Balance	11,196
Effects of foreign currency - Goodwill	(472)
Balance	10,724
Medical Physics [Member]
Goodwill [Line Items]
Balance	22,611
Effects of foreign currency - Goodwill
Balance	$ 22,611

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant