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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 |
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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 | $ 67,331 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 75,049 us-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 | 67,331 us-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 | 63,961 us-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 | $ 3,370 us-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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