Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Income [Abstract]
Net revenues	$ 39,094	$ 32,327	$ 75,763	$ 60,765
Costs and expenses:
Cost of sales	16,029	11,604	30,935	22,687
Selling, general and administrative	12,604	8,728	24,965	17,859
Acquisition and reorganization costs	312	115	2,161	212
Costs and expenses	28,945	20,447	58,061	40,758
Operating income	10,149	11,880	17,702	20,007
Equity in income of joint ventures	1,067	615	1,871	1,126
Interest income (expense), net	(863)	13	(1,453)	4
Other income (expense), net	(9)	(88)	50	13
Income before taxes	10,344	12,420	18,170	21,150
Income taxes	3,104	4,294	5,846	7,031
Net income	7,240	8,126	12,324	14,119
Less: Net income attributed to noncontrolling interest	130	129	289	303
Net income attributed to Landauer, Inc.	$ 7,110	$ 7,997	$ 12,035	$ 13,816
Net income per share attributable to Landauer, Inc. shareholders:
Basic	$ 0.76	$ 0.85	$ 1.28	$ 1.48
Weighted average basic shares outstanding	9,361	9,332	9,347	9,322
Diluted	$ 0.75	$ 0.85	$ 1.27	$ 1.47
Weighted average diluted shares outstanding	9,402	9,377	9,387	9,367