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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	May 31, 2014	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011
Reasons for consolidated income tax provision
Income tax (benefit) provision	$ 3,325us-gaap_IncomeTaxExpenseBenefit	$ 3,074us-gaap_IncomeTaxExpenseBenefit	$ (376)us-gaap_IncomeTaxExpenseBenefit	$ (239)us-gaap_IncomeTaxExpenseBenefit	$ 2,559us-gaap_IncomeTaxExpenseBenefit
Effect of Graduated tax rates		57us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	16us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(57)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
State income taxes, net of Federal tax benefit		(122)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(95)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(152)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income tax credits, net of Federal tax benefit		0ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits	23ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits	69ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits
Impact of Non US operations		27ango_IncomeTaxReconciliationEffectOfForeignOperations	228ango_IncomeTaxReconciliationEffectOfForeignOperations	(46)ango_IncomeTaxReconciliationEffectOfForeignOperations
Tax-exempt interest		0us-gaap_IncomeTaxReconciliationTaxExemptIncome	2us-gaap_IncomeTaxReconciliationTaxExemptIncome	4us-gaap_IncomeTaxReconciliationTaxExemptIncome
Research and development tax credit		236us-gaap_IncomeTaxReconciliationTaxCreditsResearch	142us-gaap_IncomeTaxReconciliationTaxCreditsResearch	115us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Domestic Production Activities deduction		0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	71us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Nondeductible acquisition costs		0ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts	(110)ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts	(1,144)ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts
Nondeductible interest on contingent payments		(540)ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment	(130)ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment	0ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment
Nontaxable gain on revaluation of contingent consideration liability		1,698ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability	0ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability	0ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability
Tax law change		(1,173)ango_EffectiveIncomeTaxRateReconciliationTaxLawChange	0ango_EffectiveIncomeTaxRateReconciliationTaxLawChange	0ango_EffectiveIncomeTaxRateReconciliationTaxLawChange
Effect of elimination of ASC 718 APIC pool		(440)ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool	0ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool	0ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool
Nondeductible stock-based compensation		(176)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	(108)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	(125)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Other nondeductible expenses		(384)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	(336)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	(336)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Overaccrual (underaccrual) of prior year Federal and state taxes		(249)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	10us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	138us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Fully reserved capital losses		0ango_IncomeTaxReconciliationFullyReservedCapitalLosses	179ango_IncomeTaxReconciliationFullyReservedCapitalLosses	(208)ango_IncomeTaxReconciliationFullyReservedCapitalLosses
Other		0us-gaap_IncomeTaxReconciliationOtherAdjustments	0us-gaap_IncomeTaxReconciliationOtherAdjustments	12us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax (benefit) provision at statutory tax rate of 35%		$ 2,008us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (555)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (1,898)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

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