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Segment, Customer and Geographical Reporting (Details Textual)
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Concentration Risk, Percentage 37.40%us-gaap_ConcentrationRiskPercentage1 41.60%us-gaap_ConcentrationRiskPercentage1
Contract Research [Member]    
Segment Reporting Information [Line Items]    
Concentration Risk, Percentage 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dysl_ContractResearchMember		 43.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dysl_ContractResearchMember
Minimum [Member] | Optics [Member]    
Segment Reporting Information [Line Items]    
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= dysl_ProductsAndTechnologySegmentMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= dysl_ProductsAndTechnologySegmentMember
Four Customers [Member] | Minimum [Member] | US Government [Member]    
Segment Reporting Information [Line Items]    
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= dysl_UsGovernmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dysl_FourCustomersMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= dysl_UsGovernmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dysl_FourCustomersMember
Customer Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
Concentration Risk, Percentage 72.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 64.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember