Document And Entity Information	6 Months Ended
	Mar. 31, 2015	May 04, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2015
Entity Registrant Name	LANDAUER INC
Trading Symbol	ldr
Entity Central Index Key	0000825410
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		9,578,618