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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014
Fair Value Measurements using Significant Unobservable Inputs
Balance, May 31, 2013, Financial Assets	$ 1,850us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Balance, May 31, 2013, Financial Liabilities	75,049us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Total gains or losses (realized/unrealized):
Included in earnings, Financial Assets	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Earnings revaluation gain - Included in Earnings, Financial Liabilities	(5,084)ango_FairValueLiabilitiesMeasuredonRecurringBasisGainIncludedinEarnings
Earnings revaluation expense - Included in Earnings, Financial Liabilities	3,276ango_FairValueLiabilitiesMeasuredonRecurringBasisLossIncludedinEarnings
Included in other comprehensive income, Financial Assets	(16)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Included in other comprehensive income, Financial Liabilities	0ango_FairValueLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInOtherComprehensiveIncome
Purchases, issuances and settlements, Financial Assets	(25)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Purchases, issuances and settlements, Financial Liabilities	(10,880)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
Transfers in and/or (out) of Level 3, Financial Assets	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Transfers in and/or (out) of Level 3, Financial Liabilities	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Liability Contingent Consideration Earn Out Asset	0ango_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityContingentConsiderationEarnOutAsset
Contingent liability for acquisition earn out, Financial Liabilities	4,970ango_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityContingentConsiderationEarnOutLiability
Balance, May 31, 2014, Financial Assets	1,809us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Balance, May 31, 2014, Financial Liabilities	$ 67,331us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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