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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 | $ 284,027 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 276,737 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Accumulated amortization | (78,771)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (62,064)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net carrying value, finite and indefinite intangible assets total | 205,256 us-gaap_IntangibleAssetsNetExcludingGoodwill | 214,673 us-gaap_IntangibleAssetsNetExcludingGoodwill | 147,363 us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived intangible assets | 86,645 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 150,181 us-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 | 48,797 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 125,346 us-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 | 150,298 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember | 84,479 us-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 | 117,368 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_ProductTechnologiesMember | 53,709 us-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 | 7,639 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember | 6,302 us-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 | 2,428 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicenseAgreementTermsMember | 1,801 us-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 | 6,345 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 6,275 us-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 | 4,463 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 5,217 us-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 | 900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember | 900 us-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 | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ango_DistributorRelationshipsMember | 0 us-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 | 28,600 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember | 28,600 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember |
Net carrying value, indefinite-lived intangible assets | 28,600 ango_IndefiniteLivedIntangibleAssetsExcludingGoodwillNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_TrademarkNamicMember | 28,600 ango_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 | 3,600 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_ResearchAndDevelopmentMember |  |
Net carrying value, indefinite-lived intangible assets | $ 3,600 ango_IndefiniteLivedIntangibleAssetsExcludingGoodwillNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ango_ResearchAndDevelopmentMember |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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