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Segments and Geographic Information (Details Textual) | 12 Months Ended
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May 31, 2014 Segment | May 31, 2013 | May 31, 2012
Segments and Geographic Information (Textual) [Abstract] |  |  |
International sales percentage of total net sales | 19.00%ango_PercentageOfInternationalSalesToNetSales | 20.00%ango_PercentageOfInternationalSalesToNetSales | 15.00%ango_PercentageOfInternationalSalesToNetSales
Number of segment | 1 us-gaap_NumberOfOperatingSegments |  |
Total assets are located within the United States | 99.00%ango_PercentageOfDomesticAssets |  |

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- Definition Percentage of domestic assets. + References No definition available. + Details
Name: | ango_PercentageOfDomesticAssets
Namespace Prefix: | ango_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of international sales to net sales. + References No definition available. + Details
Name: | ango_PercentageOfInternationalSalesToNetSales
Namespace Prefix: | ango_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ango_SegmentsAndGeographicInformationTextualAbstract
Namespace Prefix: | ango_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration