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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 |  |  | $ 3,000,000 ango_PrepaidRoyaltyAtAgreementDate
Acquisition, restructuring and other items, net | 201,000 ango_GainOnSaleOfAssetsAssociatedWithProductLine |  |
Impairment loss |  | $ (2,300,000)ango_ReductionInRealizableValueOfPrepaidRoyalties |

X
- Definition Gain resulting from sale assets associated with a product line. + References No definition available. + Details
Name: | ango_GainOnSaleOfAssetsAssociatedWithProductLine
Namespace Prefix: | ango_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | ango_PrepaidRoyaltyAtAgreementDate
Namespace Prefix: | ango_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The charge against earnings resulting from a reduction in the realizable value of prepaid royalties. + References No definition available. + Details
Name: | ango_ReductionInRealizableValueOfPrepaidRoyalties
Namespace Prefix: | ango_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration