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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 6,793	$ 5,237	$ 13,507	$ 11,241
Weighted average shares	23,828	23,418	23,752	23,369
Effect of dilutive stock options and warrants	439	556	479	632
Denominator for diluted net income per share	24,267	23,974	24,231	24,001
Net income attributable to Neogen Corporation per share:
Basic	$ 0.29	$ 0.22	$ 0.57	$ 0.48
Diluted	$ 0.28	$ 0.22	$ 0.56	$ 0.47

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