Basis Of Presentation And Consolidation (Consolidated Statements Of Income) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014		Mar. 31, 2015	Mar. 31, 2014
Service revenues	$ 32,242	$ 32,870	[1]	$ 64,299	$ 64,615	[1]
Product revenues	5,897	6,184	[1]	11,387	12,586	[1]
Net revenues	38,139	39,054	[1]	75,686	77,201	[1]
Costs and expenses:
Cost of Services	16,158	15,155	[1]	31,792	30,165	[1]
Cost of Goods Sold	2,453	3,177	[1]	4,570	6,552	[1]
Total cost of sales	18,611	18,332	[1]	36,362	36,717	[1]
Gross profit	19,528	20,722	[1]	39,324	40,484	[1]
Selling, general, and administrative	13,898	13,750	[1]	27,553	27,976	[1]
Acquisition, reorganization and nonrecurring costs		109	[1]		220	[1]
Operating income	5,630	6,863	[1]	11,771	12,288	[1]
Equity in income of joint ventures	680	535	[1]	1,376	1,816	[1]
Interest expense, net	(964)	(1,014)	[1]	(1,917)	(1,951)	[1]
Other (expense) income, net	(485)	5	[1]	(234)	164	[1]
Income before taxes	4,861	6,389	[1]	10,996	12,317	[1]
Income tax expense	1,180	1,913	[1]	2,790	3,812	[1]
Net loss	3,681	4,476	[1]	8,206	8,505	[1],[2]
Less: Net income (loss) attributed to noncontrolling interest	134	(38)	[1]	282	170	[1]
Net loss attributed to Landauer, Inc.	3,547	4,514	[1]	7,924	8,335	[1]
Net loss per share attributable to Landauer, Inc. shareholders:
Basic	$ 0.37	$ 0.47	[1]	$ 0.83	$ 0.87	[1]
Weighted average basic shares outstanding	9,493	9,460	[1]	9,464	9,441	[1]
Diluted	$ 0.37	$ 0.47	[1]	$ 0.83	$ 0.87	[1]
Weighted average diluted shares outstanding	9,520	9,501	[1]	9,492	9,485	[1]
As Previously Reported [Member]
Service revenues		32,983			64,877
Product revenues		6,571			12,382
Net revenues		39,554			77,259
Costs and expenses:
Cost of Services		15,195			30,244
Cost of Goods Sold		3,150			6,308
Total cost of sales		18,345			36,552
Gross profit		21,209			40,707
Selling, general, and administrative		13,735			28,097
Acquisition, reorganization and nonrecurring costs		109			220
Operating income		7,365			12,390
Equity in income of joint ventures		535			1,108
Interest expense, net		(975)			(1,867)
Other (expense) income, net		(8)			29
Income before taxes		6,917			11,660
Income tax expense		1,954			3,450
Net loss		4,963			8,210	[2]
Less: Net income (loss) attributed to noncontrolling interest		(34)			162
Net loss attributed to Landauer, Inc.		$ 4,997			$ 8,048
Net loss per share attributable to Landauer, Inc. shareholders:
Basic		$ 0.52			$ 0.84
Weighted average basic shares outstanding		9,460			9,441
Diluted		$ 0.52			$ 0.84
Weighted average diluted shares outstanding		9,501			9,485

[1] As Restated

[2] As reported in the Company's 2014 third fiscal quarter Form 10-Q (filed on August 11, 2014), certain errors were identified in the Consolidated Statement of Cash Flows that impacted prior periods.  The errors related to the following:   treatment of accrued additions for property, plant and equipment, classification of debt financing fees and classification of unrealized gains or losses on investments in the Consolidated Statements of Cash Flows.   The prior period consolidated statements of cash flows were revised in the 2014 third fiscal quarter Form 10-Q to correct for these errors and the impacts of the corrections are reflected within the 'Previously Reported' columns above.