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

Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

Subsequent Events - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 06, 2015	Sep. 26, 2014	Apr. 09, 2015	Mar. 06, 2015	Apr. 01, 2015	May 31, 2014	Apr. 30, 2010	Mar. 02, 2015
Subsequent Event [Line Items]
Common stock, shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized							100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized
Convertible notes	$ 3,247,741us-gaap_ConvertibleDebt		$ 1,500,000us-gaap_ConvertibleDebt	$ 2,000,000us-gaap_ConvertibleDebt
Convertible note conversion price per share	$ 0.75
Cash interest payment	170,934us-gaap_InterestPaid	165,354us-gaap_InterestPaid
Warrants to purchase shares of common stock, exercise price	$ 0.50
Face amount of notes	0cydy_ConvertibleNotesFaceAmount							1,200,000cydy_ConvertibleNotesFaceAmount
Alpha Venture Capital Partners, L.P.
Subsequent Event [Line Items]
Convertible note conversion price per share	$ 1.00		$ 1.00	$ 1.00
Warrants to purchase shares of common stock	325,000
Warrants to purchase shares of common stock, exercise price	$ 0.50		$ 0.50	$ 0.50
Face amount of notes	3,500,000		1,500,000	2,000,000
Convertible note maturity date	Sep. 26, 2016		May 05, 2015	Sep. 26, 2016
2012 Equity Incentive Plan
Subsequent Event [Line Items]
Warrants to purchase shares of common stock	325,000
Subsequent Event
Subsequent Event [Line Items]
Common stock, shares authorized										200,000,000
Convertible notes term					3 years
Convertible notes					3,046,250
Accrued but unpaid interest					96,595
Convertible note conversion price per share					$ 0.75
Common stock issued upon conversion of notes					4,181,079
Cash interest payment					7,028
Warrants to purchase shares of common stock					5,555,000	150,000
Warrants to purchase shares of common stock, exercise price					$ 1.00	$ 0.83
Exercisable warrants, expire period						5 years
Exercisable warrants, vesting percentage						50.00%
Exercisable warrants, expire period						2 years
Subsequent Event \| Alpha Venture Capital Partners, L.P.
Subsequent Event [Line Items]
Face amount of notes							$ 1,500,000
Convertible note maturity date							May 05, 2015
Subsequent Event \| Alpha Venture Capital Partners, L.P. \| Revised
Subsequent Event [Line Items]
Convertible note maturity date							Aug. 05, 2015
Subsequent Event \| Exercisable through December 2015
Subsequent Event [Line Items]
Warrants to purchase shares of common stock					186,667
Subsequent Event \| Exercisable until January 15, 2016
Subsequent Event [Line Items]
Warrants to purchase shares of common stock					160,000
Subsequent Event \| 2012 Equity Incentive Plan \| Stock Options
Subsequent Event [Line Items]
Shares available for future issuance										2,000,000