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Marketable Securities - Additional Information (Detail) $ in Millions | Nov. 30, 2015 USD ($) Investment | May. 31, 2015 USD ($)
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Marketable Securities [Abstract] |  |
Investments in auction rate securities that failed auctions | $ | $ 1.6 | $ 1.7
Number of investments | Investment | 2 |

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- Definition Number of investments failed at auction. + References No definition available. + Details
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Namespace Prefix: | ango_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The value of securities held, for which the interest rate resets through an auction process, that are categorized neither as trading nor held-to-maturity, that failed to be liquidated through auction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration