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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Summary of significant components of deferred income tax (benefit) expense from operations      
Deferred tax expense (benefit) $ 1,778ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward $ 830ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward $ (1,773)ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward
Impact of NYS tax reform legislation 1,173ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation 0ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation 0ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation
Net operating loss carryforward 0ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense 0ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense 1,087ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense
Deferred Income Tax Expense (Benefit) $ 2,951us-gaap_DeferredIncomeTaxExpenseBenefit $ 830us-gaap_DeferredIncomeTaxExpenseBenefit $ (686)us-gaap_DeferredIncomeTaxExpenseBenefit