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Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011
Net Sales by Geography
Net sales	$ 94,060us-gaap_SalesRevenueNet	$ 88,150us-gaap_SalesRevenueNet	$ 88,571us-gaap_SalesRevenueNet	$ 83,644us-gaap_SalesRevenueNet	$ 89,932us-gaap_SalesRevenueNet	$ 81,571us-gaap_SalesRevenueNet	$ 87,007us-gaap_SalesRevenueNet	$ 83,406us-gaap_SalesRevenueNet	$ 354,425us-gaap_SalesRevenueNet	$ 341,916us-gaap_SalesRevenueNet	$ 221,917us-gaap_SalesRevenueNet	$ 215,620us-gaap_SalesRevenueNet
United States [Member]
Net Sales by Geography
Net sales									280,161us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	266,228us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	188,317us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
International [Member]
Net Sales by Geography
Net sales									68,219us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ango_InternationalMember	67,190us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ango_InternationalMember	33,600us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ango_InternationalMember
Supply Agreement [Member]
Net Sales by Geography
Net sales									$ 6,045us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ango_SupplyAgreementMember	$ 8,498us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ango_SupplyAgreementMember	$ 0us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ango_SupplyAgreementMember

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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