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Income Taxes (Details Textual) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012 | May 31, 2011
Income Taxes (Textual) [Abstract] |  |  |  |
Remaining federal net operating loss | $ 26,100,000 ango_FederalNetOperatingLossExpectedToExpireBeforeUtilization |  |  |
State net operating loss expire prior to utilization | 13,000,000 ango_StateNetOperatingLossExpectedToExpireBeforeUtilization |  |  |
Taxable income per year for the next ten years | 10,000,000 ango_ExpectedProfitPerYearInNextTenYearsToReverseDeferredTaxAssets |  |  |
Taxable income per year for the final eight years | 6,500,000 ango_ExpectedProfitPerYearInFinalEightYearsToReverseDeferredTaxAssets |  |  |
Federal net operating loss carryforwards after considering IRC Section 382 limitations | 139,800,000 ango_FederalNetOperatingLossCarryforwardAfterConsideringLimitations |  |  |
Federal net operating loss first amount expiring | 30,700,000 ango_FederalNetOperatingLossExpectedExpirationAmountOne |  |  |
Maturity period of federal net operating loss carryforwards first amount minimum | 2017 |  |  |
Maturity period of federal net operating loss carryforwards first amount maximum | 2026 |  |  |
Federal Net Operating Loss Expected Expiration Amount Two | 109,100,000 ango_FederalNetOperatingLossExpectedExpirationAmountTwo |  |  |
Maturity period of federal net operating loss carryforwards second amount minimum | 2027 |  |  |
Maturity period of federal net operating loss carryforwards second amount maximum | 2033 |  |  |
State net operating loss carryforwards after considering remaining IRC Section 382 limitations | 20,900,000 ango_StateNetOperatingLossCarryforwardAfterConsideringLimitations |  |  |
Maturity period of state net operating loss carryforwards minimum | 2015 |  |  |
Net deferred income tax asset | 13,900,000 us-gaap_DeferredTaxAssetsNet |  |  |
Valuation Allowance | (1,532,000)us-gaap_DeferredTaxAssetsValuationAllowance | (712,000)us-gaap_DeferredTaxAssetsValuationAllowance |  |
Increase decrease valuation allowance | 800,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 500,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Effective income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |  |
Tax liability not recognized | 0 ango_LiabilityForUncertainTaxPositions |  |  |
Unrecognized tax benefits | 0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |
Accrued interest and penalties recognized | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Correct state tax credit benefit |  |  |  | 300,000 ango_BenefitOfCorrectCertainStateTaxCredits
State tax credit claim |  |  | 200,000 ango_ClaimOfStateTaxCredits |
Beginning of open tax year range | 2011 |  |  |
End of open tax year range | 2014 |  |  |
State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Federal and State net operating loss carryforwards | 33,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Federal and State net operating loss carryforwards | 166,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |
Operating loss carryforwards from acquired companies | $ 161,500,000 ango_OperatingLossCarryforwardsGeneratedbyAcquiredCompanies / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |

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