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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Feb. 01, 2013
May 22, 2012
Oct. 15, 2012
May 31, 2014
May 31, 2013
May 31, 2012
Dec. 31, 2013
Summary of estimated fair values of the assets acquired and liabilities assumed              
Goodwill       $ 360,473us-gaap_Goodwill $ 355,637us-gaap_Goodwill $ 309,091us-gaap_Goodwill  
Microsulis Medical Ltd [Member]              
Summary of estimated fair values of the assets acquired and liabilities assumed              
Accounts receivable 364us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Prepaid expenses and other current assets 443us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Inventories 687us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Fixed assets 1,906us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Intangibles 12,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Goodwill 19,284us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
    19,284us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
     
Total assets acquired 35,184us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Liabilities assumed (1,634)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Total purchase price 33,550us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Cash payment at closing 10,566us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Cash payment for initial investment 5,000ango_BusinessAcquisitionCostOfAcquiredEntityInitialInvestment
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
          5,000ango_BusinessAcquisitionCostOfAcquiredEntityInitialInvestment
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
Present value of deferred payment 4,820ango_BusinessAcquisitionCostOfAcquiredEntityPresentValueOfDeferredPayment
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Present value of contingent consideration liability 13,164us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Total purchase price 33,550us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ango_MicrosulisMedicalLtdMember
           
Navilyst [Member]              
Summary of estimated fair values of the assets acquired and liabilities assumed              
Cash and cash equivalents   7,683us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Accounts receivable   19,069us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Prepaid expenses and other current assets   5,504us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Inventories   26,851us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Fixed assets   34,017us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Deferred tax assets   34,209us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Intangibles   107,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Other long-term assets   497us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Goodwill   144,705us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Total assets acquired   379,635us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Liabilities assumed   (18,287)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Total purchase price   361,348us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Cash payment at closing   97,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Total purchase price   361,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ango_NavilystMember
         
Vortex Medical [Member]              
Summary of estimated fair values of the assets acquired and liabilities assumed              
Cash and cash equivalents     339us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Accounts receivable     203us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Prepaid expenses and other current assets     7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Inventories     488us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Deferred tax assets     1,307us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Intangibles     72,430us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Goodwill     29,519us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
29,519us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
     
Total assets acquired     104,293us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Deferred tax liabilities     (28,340)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Liabilities assumed     (661)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Total purchase price     75,292us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Cash payment at closing     15,105us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Working capital adjustment     (115)ango_BusinessCombinationConsiderationTransferredWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Present value of contingent consideration liability     60,302us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember
       
Total purchase price     $ 75,292us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ango_VortexMedicalMember