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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 67,331us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	$ 75,049us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	12.00%us-gaap_FairValueInputsDiscountRate
Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	67,331us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Revenue Based Payment [Member] | Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	63,961us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_ValuationTechniqueAxis = ango_RevenueBasedPaymentMember
Revenue Based Payment [Member] | Level 3 [Member] | Maximum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ango_RevenueBasedPaymentMember
Probability of payment	100.00%ango_FairValueInputsProbabilityOfPayment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ango_RevenueBasedPaymentMember
Projected fiscal year of payment	2022
Revenue Based Payment [Member] | Level 3 [Member] | Minimum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	4.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ango_RevenueBasedPaymentMember
Probability of payment	75.00%ango_FairValueInputsProbabilityOfPayment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ango_RevenueBasedPaymentMember
Projected fiscal year of payment	2015
Milestone Based Payments [Member] | Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 3,370us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_ValuationTechniqueAxis = ango_MilestoneBasedPaymentsMember
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	16.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_ValuationTechniqueAxis = ango_MilestoneBasedPaymentsMember
Projected fiscal year of payment	2015
Milestone Based Payments [Member] | Level 3 [Member] | Maximum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	100.00%ango_FairValueInputsProbabilityOfPayment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ango_MilestoneBasedPaymentsMember
Milestone Based Payments [Member] | Level 3 [Member] | Minimum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	75.00%ango_FairValueInputsProbabilityOfPayment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ango_MilestoneBasedPaymentsMember

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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