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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |
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Mar. 31, 2014 Observation | Sep. 24, 2012 Observation | Feb. 13, 2012 Observation | Feb. 10, 2012 Observation | Apr. 21, 2014 | Feb. 25, 2014 | Oct. 15, 2012 | Mar. 05, 2012 | May 31, 2014 Intangible_Asset Investment | May 31, 2013 Investment | May 31, 2012 | May 22, 2012 | Jun. 30, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs for quality call to action program |  |  |  |  |  |  |  |  | $ 3,200,000 ango_CostsForQualityCallToActionProgram |  |  |  |
Number of observations | 3 ango_NumberOfObservations | 5 ango_NumberOfObservations | 6 ango_NumberOfObservations | 12 ango_NumberOfObservations |  |  |  |  |  |  |  |  |
Number of business days to provide response to FDA |  |  |  |  | 15 days | 15 days | 15 days | 15 days |  |  |  |  |
Short Term Investments Maturity Period |  |  |  |  |  |  |  |  | less than three months |  |  |  |
Investments in auction rate securities that failed auctions |  |  |  |  |  |  |  |  | 1,809,000 us-gaap_AvailableforsaleSecuritiesFailedAuctionValue | 1,800,000 us-gaap_AvailableforsaleSecuritiesFailedAuctionValue |  |  |
Number of investments |  |  |  |  |  |  |  |  | 2 ango_NumberOfInvestmentsFailedAtAuction | 2 ango_NumberOfInvestmentsFailedAtAuction |  |  |
Number of Indefinite Lived Intangible Assets |  |  |  |  |  |  |  |  | 1 ango_NumberOfIndefiniteLivedIntangibleAssets |  |  |  |
Restocking charge percentage |  |  |  |  |  |  |  |  | 20.00%ango_PercentageOfRestockingCharge |  |  |  |
Estimated net operating losses, prior to utilization |  |  |  |  |  |  |  |  | 13,000,000 ango_StateNetOperatingLossExpectedToExpireBeforeUtilization |  |  |  |
Potential amount of undiscounted future contingent consideration |  |  |  |  |  |  |  |  | 78,100,000 ango_UndiscountedContingentConsiderationFairValueFairValueDisclosure |  |  |  |
Milestones associated with the contingent consideration |  |  |  |  |  |  |  |  | 56,400,000 ango_NoncurrentPortionContingentMilestonePaymentsFairValueDisclosure |  |  |  |
Reflected in current portion of contingent consideration |  |  |  |  |  |  |  |  | 10,900,000 ango_ContingentConsiderationAtRemeasurementDate |  |  |  |
Interest expense on derivative financial instruments |  |  |  |  |  |  |  |  |  | 61,000 ango_DerivativeInstrumentInterestExpense |  |  |
Notional amount of interest rate swap agreement |  |  |  |  |  |  |  |  | 100,000,000 us-gaap_DerivativeAssetNotionalAmount |  |  |  |
Fixed interest rate payments |  |  |  |  |  |  |  |  |  |  |  |  | 3.26%us-gaap_DerivativeSwaptionInterestRate
Stock-based compensation, options vested, percentage |  |  |  |  |  |  |  |  | 88.00%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestPercentage |  |  |  |
Stock-based compensation, options forfeiture rate |  |  |  |  |  |  |  |  | 12.00%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedForfeitureRate |  |  |  |
Dividend paid |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfDividends |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share |  |  |  |  |  |  |  |  | 2.3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 2.9 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 2.3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Clinical Devices, B.V. [Member] | Trademark-NAMIC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible asset |  |  |  |  |  |  |  |  | 3,600,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember |  |  |  |
Navilyst [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  | 10 years |
Federal net operating losses, unutilized |  |  |  |  |  |  |  |  | 17,500,000 ango_FederalNetOperatingLossesUnutilized / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember |  |  |  |
Estimated net operating losses, prior to utilization |  |  |  |  |  |  |  |  | 13,000,000 ango_StateNetOperatingLossExpectedToExpireBeforeUtilization / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember |  |  |  |
Navilyst [Member] | Trademark-NAMIC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible asset |  |  |  |  |  |  |  |  | 28,600,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember |  |  | 28,600,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember |
RITA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal net operating losses, unutilized |  |  |  |  |  |  |  |  | 15,800,000 ango_FederalNetOperatingLossesUnutilized / us-gaap_BusinessAcquisitionAxis = ango_RitaMember |  |  |  |
Federal net operating losses, utilized |  |  |  |  |  |  |  |  | 7,100,000 ango_FederalNetOperatingLossesExpired / us-gaap_BusinessAcquisitionAxis = ango_RitaMember |  |  |  |
Estimated net operating losses, prior to utilization |  |  |  |  |  |  |  |  | $ 13,600,000 ango_StateNetOperatingLossExpectedToExpireBeforeUtilization / us-gaap_BusinessAcquisitionAxis = ango_RitaMember |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivables period due |  |  |  |  |  |  |  |  | 90 days |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  | 20 years |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivables period due |  |  |  |  |  |  |  |  | 30 days |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Undamaged product expiration date |  |  |  |  |  |  |  |  | 12 months |  |  |  |

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