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Accrued Liabilities - Summary of Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
May 31, 2014
May 31, 2013
May 31, 2012
Other Liabilities Disclosure [Abstract]        
Payroll and related expenses $ 8,797us-gaap_EmployeeRelatedLiabilitiesCurrent $ 8,114us-gaap_EmployeeRelatedLiabilitiesCurrent    
Royalties 2,343us-gaap_AccruedRoyaltiesCurrent 2,620us-gaap_AccruedRoyaltiesCurrent    
Accrued severance 1,020us-gaap_RestructuringReserveCurrent 765us-gaap_RestructuringReserveCurrent    
Sales and franchise taxes 1,398us-gaap_SalesAndExciseTaxPayableCurrent 1,327us-gaap_SalesAndExciseTaxPayableCurrent    
Interest rate swap liability 400ango_InterestRateSwapLiabilityCurrent 555ango_InterestRateSwapLiabilityCurrent    
Other 5,219us-gaap_OtherAccruedLiabilitiesCurrent 3,271us-gaap_OtherAccruedLiabilitiesCurrent    
Total $ 19,177us-gaap_AccruedLiabilitiesCurrent $ 16,652us-gaap_AccruedLiabilitiesCurrent $ 16,356us-gaap_AccruedLiabilitiesCurrent $ 17,070us-gaap_AccruedLiabilitiesCurrent