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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 6,652	$ 5,244	$ 20,158	$ 16,485
Weighted average shares	23,894	23,541	23,799	23,428
Effect of dilutive stock options and warrants	508	447	504	571
Denominator for diluted net income per share	24,402	23,988	24,303	23,999
Net income attributable to Neogen Corporation per share:
Basic	$ 0.28	$ 0.22	$ 0.85	$ 0.70
Diluted	$ 0.27	$ 0.22	$ 0.83	$ 0.69

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