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Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite and indefinite intangible assets total	$ 284,027us-gaap_IntangibleAssetsGrossExcludingGoodwill	$ 276,737us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated amortization	(78,771)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(62,064)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net carrying value, finite and indefinite intangible assets total	205,256us-gaap_IntangibleAssetsNetExcludingGoodwill	214,673us-gaap_IntangibleAssetsNetExcludingGoodwill	147,363us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite-lived intangible assets	86,645us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	150,181us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated amortization	(37,848)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(24,835)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net carrying value, finite-lived intangible assets	48,797us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	125,346us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted average useful life	11 years 10 months 24 days	10 years 7 months 6 days
Product technologies [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite-lived intangible assets	150,298us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember	84,479us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember
Accumulated amortization	(32,930)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember	(30,770)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember
Net carrying value, finite-lived intangible assets	117,368us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember	53,709us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember
Weighted average useful life	10 years 2 months 12 days	14 years 9 months 18 days
Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite-lived intangible assets	7,639us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember	6,302us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember
Accumulated amortization	(5,211)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember	(4,501)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember
Net carrying value, finite-lived intangible assets	2,428us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember	1,801us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember
Weighted average useful life	8 years 4 months 24 days	9 years
Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite-lived intangible assets	6,345us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	6,275us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Accumulated amortization	(1,882)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	(1,058)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Net carrying value, finite-lived intangible assets	4,463us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	5,217us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Weighted average useful life	8 years	9 years 10 months 24 days
Distributor relationships [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, finite-lived intangible assets	900us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember	900us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember
Accumulated amortization	(900)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember	(900)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember
Net carrying value, finite-lived intangible assets	0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember	0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember
Weighted average useful life	3 years	3 years
Trademark-NAMIC [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, indefinite-lived intangible assets	28,600us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember	28,600us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember
Net carrying value, indefinite-lived intangible assets	28,600ango_IndefiniteLivedIntangibleAssetsExcludingGoodwillNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember	28,600ango_IndefiniteLivedIntangibleAssetsExcludingGoodwillNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember
In-process R&D acquired [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value, indefinite-lived intangible assets	3,600us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_ResearchAndDevelopmentMember
Net carrying value, indefinite-lived intangible assets	$ 3,600ango_IndefiniteLivedIntangibleAssetsExcludingGoodwillNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_ResearchAndDevelopmentMember

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Name Accounting Standards Codification

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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+ References

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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