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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 | May 31, 2014 | May 31, 2013 | May 31, 2012 | Oct. 15, 2012 | Feb. 01, 2013 | May 22, 2012 | Aug. 15, 2013
Adjustments to Goodwill |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  | $ 355,637 us-gaap_Goodwill | $ 309,091 us-gaap_Goodwill |  |  |  |
Adjustments to Navilyst purchase price allocation | 500 us-gaap_GoodwillPurchaseAccountingAdjustments |  |  |  |  |  |  |
Goodwill, Ending Balance | 360,473 us-gaap_Goodwill | 360,473 us-gaap_Goodwill | 355,637 us-gaap_Goodwill | 309,091 us-gaap_Goodwill |  |  |  |
Vortex Medical [Member] |  |  |  |  |  |  |  |
Adjustments to Goodwill |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  |  | 29,519 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember |  |  |
Goodwill recognized from business combination and asset acquisition |  | 29,519 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember |  |  |  |  |  |
Goodwill, Ending Balance | 29,519 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember | 29,519 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember |  |  | 29,519 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember |  |  |
Microsulis Medical Ltd [Member] |  |  |  |  |  |  |  |
Adjustments to Goodwill |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  |  |  | 19,284 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember |  |
Goodwill recognized from business combination and asset acquisition |  | 19,284 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember |  |  |  |  |  |
Goodwill, Ending Balance | 19,284 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember | 19,284 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember |  |  |  | 19,284 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember |  |
Navilyst [Member] |  |  |  |  |  |  |  |
Adjustments to Goodwill |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  |  |  |  | 144,705 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember |
Adjustments to Navilyst purchase price allocation |  | (2,257)us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  | 144,705 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember |
Clinical Devices, B.V. [Member] |  |  |  |  |  |  |  |
Adjustments to Goodwill |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  |  |  |  |  | 4,800 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member
Goodwill recognized from business combination and asset acquisition |  | 4,836 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  | $ 4,800 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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