Income Per Common Share (Computation Of Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Per Common Share [Abstract]
Net income attributed to Landauer, Inc.	$ 4,279	$ 3,547	$ 7,922	$ 7,924
Less: Income allocated to unvested restricted stock	21	18	39	47
Net income available to common stockholders	$ 4,258	$ 3,529	$ 7,883	$ 7,877
Basic weighted average shares outstanding	9,518	9,493	9,483	9,464
Basic	$ 0.45	$ 0.37	$ 0.83	$ 0.83
Effect of dilutive securities	$ 32	$ 27	$ 33	$ 28
Diluted weighted averages shares outstanding	9,550	9,520	9,516	9,492
Net income per share - Diluted	$ 0.45	$ 0.37	$ 0.83	$ 0.83
Dividends paid per share	$ 0.275	$ 0.275	$ 0.55	$ 0.825