Basis Of Presentation And Consolidation (Net Income (Loss) And Diluted Net Income (Loss) Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity in joint ventures	$ 696	$ 1,281
Income before taxes	6,135	5,928
Income tax expense (benefit)	1,610	1,899
Less amounts attributed to noncontrolling interest	148	208
Net loss attributed to Landauer, Inc.	4,377	3,821
Earnings Per Share, Diluted, Total	$ 0.46	$ 0.40
As Previously Reported [Member]
Equity in joint ventures		573
Income before taxes		4,743
Income tax expense (benefit)		1,496
Less amounts attributed to noncontrolling interest		196
Net loss attributed to Landauer, Inc.		3,051
Total adjustments, Diluted Net Income (Loss) Per Share		$ 0.32
Earnings Per Share, Diluted, Total		$ 0.32
Adjustment [Member]
Revenue and accounts receivable		252
Dosimetry devices		12
Long-term investments		79
Sales taxes		(16)
Intangible assets		150
Equity in joint ventures		708
Income before taxes		1,185
Income tax expense (benefit)		403
Less amounts attributed to noncontrolling interest		12
Net loss attributed to Landauer, Inc.		$ 770
Total adjustments, Diluted Net Income (Loss) Per Share		$ 0.12
Income tax expense (benefit), Diluted Net Income (Loss) Per Share		$ 0.04
Less amounts attributed to noncontrolling interest, Diluted Net Income (Loss) Per Share
Earnings Per Share, Diluted, Total		$ 0.08