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.

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-Name Accounting Standards Codification

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill And Other Intangible Assets (Changes In The Carrying Amount Of Goodwill, By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Goodwill [Line Items]
Goodwill	$ 84,436us-gaap_Goodwill	$ 106,717us-gaap_Goodwill	$ 44,645us-gaap_Goodwill	$ 86,384us-gaap_Goodwill	$ 86,529us-gaap_Goodwill	$ 83,833us-gaap_Goodwill	$ 106,746us-gaap_Goodwill	$ 107,001us-gaap_Goodwill
Increase related to acquisitions	1,775us-gaap_GoodwillAcquiredDuringPeriod	419us-gaap_GoodwillAcquiredDuringPeriod
Effects of foreign currency	(1,625)us-gaap_GoodwillTranslationAdjustments	(22,700)us-gaap_GoodwillTranslationAdjustments
Accumulated goodwill impairment charges	(41,368)
Goodwill	43,218us-gaap_Goodwill	84,436us-gaap_Goodwill	44,645us-gaap_Goodwill	86,384us-gaap_Goodwill	86,529us-gaap_Goodwill	83,833us-gaap_Goodwill	106,746us-gaap_Goodwill	107,001us-gaap_Goodwill
Radiation Measurement [Member]
Goodwill [Line Items]
Goodwill	20,456	20,037
Increase related to acquisitions		419
Effects of foreign currency	(1,495)
Goodwill	18,961	20,456
Medical Physics [Member]
Goodwill [Line Items]
Goodwill									22,611
Goodwill	22,611	22,611							22,611
Medical Products [Member]
Goodwill [Line Items]
Goodwill	41,369	64,069
Increase related to acquisitions	1,775
Effects of foreign currency	(130)	(22,700)
Accumulated goodwill impairment charges	(41,368)
Goodwill	$ 1,646	$ 41,369