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Marketable Securities (Details Textual) (USD $) In Millions, unless otherwise specified	Nov. 30, 2012 Investment	May 31, 2012 Investment
Marketable securities (Textual) [Abstract]
Investments in auction rate securities that failed auctions	$ 1.85	$ 1.85
Number of investments	2	2

X

- Details

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Namespace Prefix:	ango_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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