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Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2018 | May 31, 2017 | May 31, 2016
Retirement Plans (Textual) [Abstract] |  |  |
Matching contributions | $ 3.9 | $ 4.2 | $ 3.7

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- Definition Retirement Plans (Textual) [Abstract] + References No definition available. + Details
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Namespace Prefix: | ango_
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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