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Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Retirement Plans (Textual) [Abstract]
Matching contributions	$ 2.8us-gaap_DefinedContributionPlanCostRecognized	$ 2.5us-gaap_DefinedContributionPlanCostRecognized	$ 2.0us-gaap_DefinedContributionPlanCostRecognized

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- Details

Name:	ango_RetirementPlansTextualAbstract
Namespace Prefix:	ango_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration