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Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 28, 2015		Feb. 28, 2014		Feb. 28, 2015		Feb. 28, 2014		May 31, 2014
Segment Reporting Information [Line Items]
Product revenues to external customers	$ 59,172us-gaap_SalesRevenueGoodsNet		$ 54,623us-gaap_SalesRevenueGoodsNet		$ 179,206us-gaap_SalesRevenueGoodsNet		$ 159,198us-gaap_SalesRevenueGoodsNet
Service revenues to external customers	9,237us-gaap_SalesRevenueServicesNet		7,373us-gaap_SalesRevenueServicesNet		25,257us-gaap_SalesRevenueServicesNet		20,945us-gaap_SalesRevenueServicesNet
Total revenues to external customers	68,409us-gaap_SalesRevenueNet		61,996us-gaap_SalesRevenueNet		204,463us-gaap_SalesRevenueNet		180,143us-gaap_SalesRevenueNet
Operating income (loss)	12,160us-gaap_OperatingIncomeLoss		10,293us-gaap_OperatingIncomeLoss		38,496us-gaap_OperatingIncomeLoss		32,400us-gaap_OperatingIncomeLoss
Total assets	378,435us-gaap_Assets		330,350us-gaap_Assets		378,435us-gaap_Assets		330,350us-gaap_Assets		345,301us-gaap_Assets
Operating Segments | Food Safety
Segment Reporting Information [Line Items]
Product revenues to external customers	30,454us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		26,627us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		90,853us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		82,761us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember
Service revenues to external customers	1,511us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		1,393us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		5,030us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		3,656us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember
Total revenues to external customers	31,965us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		28,020us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		95,883us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		86,417us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember
Operating income (loss)	6,976us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		5,969us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		22,688us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		20,956us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember
Total assets	108,993us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		110,038us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		108,993us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember		110,038us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_FoodSafetyMember
Operating Segments | Animal Safety
Segment Reporting Information [Line Items]
Product revenues to external customers	28,718us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		27,996us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		88,353us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		76,437us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember
Service revenues to external customers	7,726us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		5,980us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		20,227us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		17,289us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember
Total revenues to external customers	36,444us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		33,976us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		108,580us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		93,726us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember
Operating income (loss)	6,087us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		5,169us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		18,228us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		13,746us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember
Total assets	178,685us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		149,202us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		178,685us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember		149,202us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = neog_AnimalSafetyMember
Corporate and Eliminations
Segment Reporting Information [Line Items]
Product revenues to external customers	0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]
Service revenues to external customers	0us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]
Total revenues to external customers	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]
Operating income (loss)	(903)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	(845)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	(2,420)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	(2,302)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]
Total assets	$ 90,757us-gaap_Assets / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	$ 71,110us-gaap_Assets / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	$ 90,757us-gaap_Assets / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]	$ 71,110us-gaap_Assets / us-gaap_ConsolidationItemsAxis = neog_CorporateAndIntersegmentEliminationsMember	[1]
[1] Includes corporate assets, consisting principally of cash and cash equivalents, marketable securities, deferred assets and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.

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