Quarterly Financial Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Net revenues	$ 39,857		$ 36,580		$ 37,082		$ 36,681		$ 37,432		$ 39,205		$ 39,094		$ 36,669		$ 150,200		$ 152,400		$ 120,458
Gross profit	20,414		18,616		20,032		20,118		20,332		21,848		23,065		21,763		79,180		87,008
Operating income (loss)	7,015	[1]	(16,776)	[1]	7,154	[1]	6,727	[1]	1,219	[1]	9,249	[1]	10,149	[1]	7,553	[1]	4,120	[1],[2]	28,170	[1]	34,883
Net income attributed to Landauer, Inc.	8,559		(13,753)		5,153		4,877		669		6,566		7,110		4,925		4,836		19,270		24,538
Basic net income (loss) per share	$ 0.90		$ (1.46)		$ 0.54		$ 0.52		$ 0.07		$ 0.70		$ 0.76		$ 0.52		$ 0.50		$ 2.04		$ 2.60
Diluted net income (loss) per share	$ 0.90		$ (1.46)		$ 0.54		$ 0.52		$ 0.07		$ 0.69		$ 0.75		$ 0.52		$ 0.49		$ 2.03		$ 2.58
Weighted average basic shares outstanding	9,462,000		9,439,000		9,417,000		9,336,000		9,397,000		9,371,000		9,361,000		9,348,000		9,434,000		9,389,000		9,395,000
Weighted average diluted shares outstanding	9,506,000		9,439,000		9,462,000		9,385,000		9,456,000		9,412,000		9,402,000		9,385,000		9,482,000		9,437,000		9,477,000
Goodwill impairment charge			22,700														22,700	[3]
Operating income	7,015	[1]	(16,776)	[1]	7,154	[1]	6,727	[1]	1,219	[1]	9,249	[1]	10,149	[1]	7,553	[1]	4,120	[1],[2]	28,170	[1]	34,883
Equity in income of joint ventures																	3,881		3,181		2,191
Adjustments [Member]
Operating income (loss)	350
Operating income	350
Equity in income of joint ventures	$ 300

[1] Third quarter of fiscal 2013 includes a $22,700 impairment charge. The fourth quarter of fiscal 2013 includes correction of certain errors relating to prior periods.  The corrections decreased operating income by approximately $350 and increased equity in income of joint ventures by approximately $300. The Company does not believe these corrections were material to any current or prior interim or annual periods that were affected.

[2] Fiscal 2013 includes $22,700 impairment charge.

[3] Restated