CytoDyn Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Net loss	$ (2,721,653)us-gaap_NetIncomeLoss	$ (3,274,397)us-gaap_NetIncomeLoss	$ (11,085,087)us-gaap_NetIncomeLoss	$ (9,435,541)us-gaap_NetIncomeLoss
Accumulated (deficit)	(57,519,320)		(57,519,320)		(46,434,232)
Insurance coverage, per depositor at each financial	250,000us-gaap_CashFDICInsuredAmount		250,000us-gaap_CashFDICInsuredAmount		250,000us-gaap_CashFDICInsuredAmount
Balance in excess of federally insured limits	1,468,000us-gaap_CashUninsuredAmount		1,468,000us-gaap_CashUninsuredAmount		4,589,000us-gaap_CashUninsuredAmount
Impairment charges	0	0	0	0
Estimated future unvested option forfeitures			0.00%
Deferred offering costs	43,292us-gaap_DeferredOfferingCosts		43,292us-gaap_DeferredOfferingCosts		68,292us-gaap_DeferredOfferingCosts
Common stock options and warrants to purchase			23,055,950	31,970,327
Additional common shares if convertible debt is converted to common stock			7,628,333
Unrecognized benefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Patents
Summary Of Significant Accounting Policies [Line Items]
Amortization period of intangible assets			10 years
Convertible Debt
Summary Of Significant Accounting Policies [Line Items]
Face amount of notes	$ 6,596,250		$ 6,596,250
Series B Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Preferred Stock Shares authorized to be issued	400,000		400,000		400,000
Common stock options and warrants to purchase	95,100		95,100		95,100
Common shares issued upon conversion of preferred stock			951,000
Maximum
Summary Of Significant Accounting Policies [Line Items]
Preferred Stock Shares authorized to be issued	5,000,000		5,000,000
Income tax examination, year under examination			2014
Minimum
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, year under examination			2012