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

X

- Definition

Number of investments failed at auction.

+ References

No definition available.

+ Details

Name:	ango_NumberOfInvestmentsFailedAtAuction
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

Name:	us-gaap_AvailableforsaleSecuritiesFailedAuctionValue
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