Business Combinations (Proforma Summary Of Landauer's Consolidated Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Actual [Member]
Revenues	$ 152,400	$ 120,458	$ 114,367
Net income attributed to Landauer, Inc.	19,270	24,538	23,674
Pro Forma [Member]
Revenues	154,658	139,096	119,040
Net income attributed to Landauer, Inc.	$ 19,404	$ 24,132	$ 23,767

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration