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		6 Months Ended		12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	May 31, 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 for issuance	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
Warrants to purchase common shares, shares	250,000		250,000
Exercise price of warrants, per share	$ 0.50		$ 0.50
Principal amount of notes			1,175,000	2,359,000	2,450,000
Cash payment				250,000us-gaap_RepaymentsOfConvertibleDebt	500,000us-gaap_RepaymentsOfConvertibleDebt
Proceeds from exercise of warrants			777,333us-gaap_ProceedsFromWarrantExercises	50,000us-gaap_ProceedsFromWarrantExercises
Interest expense associated with conversion inducement	353,333	193,160	353,333	193,160
Amortization expense			1,044,000us-gaap_AmortizationOfFinancingCosts	3,047,000us-gaap_AmortizationOfFinancingCosts
Warrants terms			5 years
Warrants risk-free interest rate			1.82%
Warrants expected life			5 years
Warrants expected volatility			136.00%
Warrants expected dividend yield			0.00%
Convertible Debt
Class of Stock [Line Items]
Convertible note, face amount	3,096,250		3,096,250
Warrants to purchase common shares, shares	1,413,333		1,413,333
Proceeds from exercise of warrants			777,333
Convertible Note One
Class of Stock [Line Items]
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			777,333
Interest expense associated with conversion inducement			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
Number of warrants shares, exercisable	1,895,380		1,895,380
Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Preferred Stock, Share issuance price	$ 0.9444		$ 0.9444
Convertible note conversion price per share	$ 1.00		$ 1.00
Face amount of notes	2,000,000		2,000,000
Interest rate on convertible notes	5.00%		5.00%
Warrants to purchase common shares, shares	250,000		250,000
Exercise price of warrants, per share	$ 0.50		$ 0.50
Convertible note maturity date			Sep. 26, 2016
Additional convertible promissory notes that may be issued	6,000,000		6,000,000
Percentage reduction to conversion price			10.00%
Warrants, expiration date			Dec. 31, 2019
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.
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%
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%
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