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Marketable Securities and Investments (Details 1) (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Amortized cost and fair value of marketable securities by contractual maturity
Amortized cost, Due in one year or less	$ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Amortized cost, Due after one through five years	0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Amortized cost, Due after five through twenty years	1,825ango_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTwentyYearsAmortizedCost
Amortized cost	1,825us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	2,153us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair Value, Due in one year or less	0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Fair Value, Due after one through five years	0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Fair Value, Due after five through twenty years	1,809ango_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTwentyYearsFairValue
Fair Value, Total	$ 1,809us-gaap_AvailableForSaleSecuritiesDebtSecurities

X

- Definition

Available for sale securities debt maturities after five through twenty years amortized cost.

+ References

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- Definition

Available for sale securities debt maturities after five through twenty years fair value.

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.2)

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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