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

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