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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Consolidated revenues $ 37,547us-gaap_Revenues $ 38,147us-gaap_Revenues  
Consolidated operating income 6,141us-gaap_OperatingIncomeLoss 5,425us-gaap_OperatingIncomeLoss  
Consolidated Assets 210,847us-gaap_Assets   216,586us-gaap_Assets
Radiation Measurement [Member]      
Consolidated revenues 26,491us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		 28,183us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		  
Consolidated operating income 9,384us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		 8,829us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		  
Consolidated Assets 142,577us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		   148,151us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember
Medical Physics [Member]      
Consolidated revenues 8,484us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		 7,739us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		  
Consolidated operating income 618us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		 433us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		  
Consolidated Assets 39,295us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		   38,851us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember
Medical Products [Member]      
Consolidated revenues 2,572us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		 2,225us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		  
Consolidated operating income 334us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		 (288)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		  
Consolidated Assets 48,337us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		   48,164us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember
Eliminations [Member]      
Consolidated Assets (19,362)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		   (18,580)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
Corporate [Member]      
Consolidated operating income $ (4,195)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ (3,549)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember