Income Per Common Share (Computation Of Net Income Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Per Common Share [Abstract]
Net income attributed to Landauer, Inc.	$ 6,566	$ 5,536	$ 18,601	$ 19,352
Less: Income allocated to unvested restricted stock	34	32	101	95
Net income available to common stockholders	$ 6,532	$ 5,504	$ 18,500	$ 19,257
Basic weighted averages shares outstanding	9,371	9,340	9,357	9,330
Net income per share - Basic	$ 0.70	$ 0.59	$ 1.98	$ 2.06
Effect of dilutive securities	41	46	40	46
Diluted weighted averages shares outstanding	9,412	9,386	9,397	9,376
Net income per share - Diluted	$ 0.69	$ 0.59	$ 1.97	$ 2.05