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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			$ 355,637us-gaap_Goodwill	$ 309,091us-gaap_Goodwill
Adjustments to Navilyst purchase price allocation	500us-gaap_GoodwillPurchaseAccountingAdjustments
Goodwill, Ending Balance	360,473us-gaap_Goodwill	360,473us-gaap_Goodwill	355,637us-gaap_Goodwill	309,091us-gaap_Goodwill
Vortex Medical [Member]
Adjustments to Goodwill
Goodwill, Beginning Balance					29,519us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember
Goodwill recognized from business combination and asset acquisition		29,519us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember
Goodwill, Ending Balance	29,519us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember	29,519us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember			29,519us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_VortexMedicalMember
Microsulis Medical Ltd [Member]
Adjustments to Goodwill
Goodwill, Beginning Balance						19,284us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember
Goodwill recognized from business combination and asset acquisition		19,284us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember
Goodwill, Ending Balance	19,284us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember	19,284us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember				19,284us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_MicrosulisMedicalLtdMember
Navilyst [Member]
Adjustments to Goodwill
Goodwill, Beginning Balance							144,705us-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							144,705us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_NavilystMember
Clinical Devices, B.V. [Member]
Adjustments to Goodwill
Goodwill, Beginning Balance								4,800us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member
Goodwill recognized from business combination and asset acquisition		4,836us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member
Goodwill, Ending Balance								$ 4,800us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ango_ClinicalDevicesB.V.Member

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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



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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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

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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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