Prepaid Royalties (Details) (USD $)	12 Months Ended
May 31, 2012	May 31, 2011	Aug. 13, 2007
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid royalty			$ 3,000,000ango_PrepaidRoyaltyAtAgreementDate
Acquisition, restructuring and other items, net	201,000
Impairment loss		$ (2,300,000)

Amount at time of agreement which was paid for royalties in advance of when the expense is to be recognized, based on achievement of certain milestones.

No definition available.

Name:	ango_PrepaidRoyaltyAtAgreementDate
Namespace Prefix:	ango_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant