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

Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

Convertible Instruments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	0 Months Ended		12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014	Feb. 06, 2015	Sep. 26, 2014	May 31, 2010	Apr. 30, 2010
Class of Stock [Line Items]
Convertible note conversion price per share	$ 0.75		$ 0.75
Common stock, shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized		100,000,000us-gaap_CommonStockSharesAuthorized		100,000,000us-gaap_CommonStockSharesAuthorized				100,000,000us-gaap_CommonStockSharesAuthorized
Constructive dividend to Preferred stock holders			$ 6,000,000
Liquidation preference on common shares	$ 5.00		$ 5.00
Dividends are payable to preferred stock holders			$ 0.25
Face amount of notes	0cydy_ConvertibleNotesFaceAmount		0cydy_ConvertibleNotesFaceAmount		1,200,000cydy_ConvertibleNotesFaceAmount
Convertible note, face amount	4,271,250us-gaap_DebtInstrumentCarryingAmount		4,271,250us-gaap_DebtInstrumentCarryingAmount		7,221,250us-gaap_DebtInstrumentCarryingAmount
Convertible note maturity start date			Oct. 01, 2015
Convertible note maturity end date			Dec. 31, 2015
Exercise price of warrants, per share	$ 0.50		$ 0.50
Principal amount of notes			1,175,000	2,459,000	2,450,000
Cash payment				250,000us-gaap_RepaymentsOfConvertibleDebt	500,000us-gaap_RepaymentsOfConvertibleDebt
Proceeds from exercise of warrants			1,066,436us-gaap_ProceedsFromWarrantExercises	50,000us-gaap_ProceedsFromWarrantExercises
Interest expense associated with conversion inducement	202,295		555,628	193,160
Amortization expense	254,000us-gaap_AmortizationOfFinancingCosts	402,000us-gaap_AmortizationOfFinancingCosts	1,299,000us-gaap_AmortizationOfFinancingCosts	3,450,000us-gaap_AmortizationOfFinancingCosts
Term of warrants			5 years
Convertible Debt
Class of Stock [Line Items]
Convertible note, face amount	3,096,250		3,096,250
Proceeds from exercise of warrants			1,066,000
Convertible Note One
Class of Stock [Line Items]
Warrants to purchase common shares, shares	525,641		525,641
Exercise price of warrants, per share	$ 0.55		$ 0.55
Number of notes converted			3
Principal amount of notes			1,175,000
Accrued but unpaid interest			4,702
Common stock issued upon conversion of notes			1,567,639
Cash payment			3,973
Common stock issued upon exercise of Warrants			1,413,333
Proceeds from exercise of warrants	289,103		777,333
Interest expense associated with conversion inducement	202,300		353,000
Convertible Note One \| Related Party
Class of Stock [Line Items]
Principal amount of notes			1,000,000
Investor
Class of Stock [Line Items]
Interest on convertible notes payment start date			Apr. 01, 2013
Warrants to purchase common shares, shares	9,451,056		9,451,056
Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Preferred Stock, Share issuance price	$ 0.9444		$ 0.9444			$ 0.9444	$ 0.9444
Convertible note conversion price per share	$ 1.00		$ 1.00			$ 1.00	$ 1.00
Face amount of notes	3,500,000		3,500,000			1,500,000	2,000,000
Interest rate on convertible notes						1.20%	5.00%
Warrants to purchase common shares, shares	325,000		325,000
Exercise price of warrants, per share	$ 0.50		$ 0.50			$ 0.50	$ 0.50
Convertible note maturity date			Sep. 26, 2016			May 05, 2015	Sep. 26, 2016
Additional convertible promissory notes that may be issued	6,000,000		6,000,000			6,000,000	6,000,000
Percentage reduction to conversion price			10.00%			10.00%	10.00%
Convertible note, conversion price description			The embedded derivative features consist of the conversion price being subject to (i) adjustment for stock splits and similar corporate events and (ii) reduction to a conversion price per share that is 10% below the lowest sale price that is below $.9444 per share for common stock sold in future securities offerings, subject to certain exempt transactions.
Detachable common stock warrants with a two-year term \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Warrants to purchase common shares, shares							250,000
Warrants, expiration date			Dec. 31, 2019
Detachable common stock warrants, with terms of two or three years \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Warrants to purchase common shares, shares						75,000
Warrants, expiration date			Feb. 28, 2020
Common Stock
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock								10
Convertible note conversion price per share								$ 0.50
Minimum
Class of Stock [Line Items]
Interest rate on convertible notes	5.00%		5.00%
Exercise price of warrants, per share	$ 0.75		$ 0.75
Minimum \| Convertible Note One
Class of Stock [Line Items]
Exercise price of warrants, per share	$ 1.50		$ 1.50
Minimum \| Investor
Class of Stock [Line Items]
Common stock warrant term			2 years
Exercise price of warrants, per share	$ 0.50		$ 0.50
Maximum
Class of Stock [Line Items]
Interest rate on convertible notes	10.00%		10.00%
Exercise price of warrants, per share	$ 2.00		$ 2.00
Maximum \| Convertible Note One
Class of Stock [Line Items]
Exercise price of warrants, per share	$ 2.00		$ 2.00
Maximum \| Investor
Class of Stock [Line Items]
Common stock warrant term			3 years
Exercise price of warrants, per share	$ 2.00		$ 2.00
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares issued	95,100		95,100		95,100			400,000
Preferred Stock, Share issuance price								$ 5.00
Cash proceeds								$ 2,009,000
Preferred stock shares outstanding	95,100		95,100		95,100