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Segments and Geographic Information (Details Textual)	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Segment Reporting [Abstract]
International sales percentage of total net sales	21.00%	19.00%	19.00%
Total assets are located within the United States	99.00%

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration