XML 26 R47.htm IDEA: XBRL DOCUMENT v3.2.0.727

Segment Information - Additional Information (Detail)	3 Months Ended								12 Months Ended
	May. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Nov. 30, 2014 USD ($)	Aug. 31, 2014 USD ($)	May. 31, 2014 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2013 USD ($)	May. 31, 2015 USD ($) Segment	May. 31, 2014 USD ($)	May. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment									2
Net Sales	$ 78,611,000	$ 68,409,000	$ 68,455,000	$ 67,599,000	$ 67,262,000	$ 61,996,000	$ 59,599,000	$ 58,548,000	$ 283,074,000	$ 247,405,000	$ 207,528,000
Foreign Operations
Segment Reporting Information [Line Items]
Net Sales									$ 103,867,000	$ 96,111,000	$ 83,171,000
Net Sales, percentage									36.70%	38.80%	40.10%
United States
Segment Reporting Information [Line Items]
Long lived assets percentage	95.00%				95.00%				95.00%	95.00%

X

- Definition

Long Lived Assets Percentage

+ References

No definition available.

+ Details

Name:	neog_LongLivedAssetsPercentage
Namespace Prefix:	neog_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Sales Revenue Goods Net Percentages

+ References

No definition available.

+ Details

Name:	neog_SalesRevenueGoodsNetPercentages
Namespace Prefix:	neog_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementGeographicalAxis=neog_ForeignOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: