Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Per Common Share [Abstract]
Net income attributed to Landauer, Inc.	$ 5,153	$ 7,110	$ 10,030	$ 12,035
Less: Income allocated to unvested restricted stock	43	35	75	67
Net income available to common stockholders	$ 5,110	$ 7,075	$ 9,955	$ 11,968
Basic weighted averages shares outstanding	9,417	9,361	9,391	9,347
Net income per share - Basic	$ 0.54	$ 0.76	$ 1.06	$ 1.28
Effect of dilutive securities	45	41	47	40
Diluted weighted averages shares outstanding	9,462	9,402	9,438	9,387
Net income per share - Diluted	$ 0.54	$ 0.75	$ 1.05	$ 1.27