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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
May 31, 2012
May 31, 2011
Accrued liabilities        
Payroll and related expenses $ 8,114us-gaap_EmployeeRelatedLiabilitiesCurrent $ 6,421us-gaap_EmployeeRelatedLiabilitiesCurrent    
Royalties 2,620us-gaap_AccruedRoyaltiesCurrent 2,034us-gaap_AccruedRoyaltiesCurrent    
Accrued severance 765us-gaap_RestructuringReserveCurrent 1,602us-gaap_RestructuringReserveCurrent    
Deferred revenue 200us-gaap_DeferredRevenueCurrent 1,573us-gaap_DeferredRevenueCurrent    
Sales and franchise taxes 1,327us-gaap_SalesAndExciseTaxPayableCurrent 1,047us-gaap_SalesAndExciseTaxPayableCurrent    
Interest rate swap liability 555ango_InterestRateSwapLiabilityCurrent 523ango_InterestRateSwapLiabilityCurrent    
Other 3,071us-gaap_OtherAccruedLiabilitiesCurrent 3,156us-gaap_OtherAccruedLiabilitiesCurrent    
Total $ 16,652us-gaap_AccruedLiabilitiesCurrent $ 16,356us-gaap_AccruedLiabilitiesCurrent $ 17,070us-gaap_AccruedLiabilitiesCurrent $ 13,734us-gaap_AccruedLiabilitiesCurrent