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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Summary showing reconciliation of the contingent payments
Contingent payments	$ 15,943us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	$ 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	$ 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Contingent Consideration Earn Out Liability [Member]
Summary showing reconciliation of the contingent payments
Balance at May 31, 2013	75,049ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisValue / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember
Purchase price contingent consideration	4,970ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisContingentConsideration / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember
Contingent payments	(10,880)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember
Earnings revaluation gain	(5,084)ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisContingentPayment / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember
Earnings revaluation expense	3,276ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisChangeInFairValueOfContingentConsideration / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember
Balance at May 31, 2014	$ 67,331ango_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisValue / us-gaap_FairValueByLiabilityClassAxis = ango_ContingentConsiderationEarnOutLiabilityMember

X

- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis change in fair value of contingent consideration.

+ References

No definition available.

+ Details

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- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis contingent consideration.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis contingent payment.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis value.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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