Document And Entity Information	3 Months Ended
	Dec. 31, 2011	Jan. 30, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2012
Entity Registrant Name	LANDAUER INC
Entity Central Index Key	0000825410
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		9,439,426