CytoDyn Inc. General form of registration statement for all companies including face-amount certificate companies

General form of registration statement for all companies including face-amount certificate companies

Related Party Transactions - Additional Information (Detail)

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		0 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014	May 31, 2013	Feb. 06, 2015	Sep. 26, 2014
Related Party Transaction [Line Items]
Face amount of notes	$ 0cydy_ConvertibleNotesFaceAmount		$ 0cydy_ConvertibleNotesFaceAmount		$ 1,200,000cydy_ConvertibleNotesFaceAmount	$ 6,588,250cydy_ConvertibleNotesFaceAmount
Convertible notes, conversion price	$ 0.75		$ 0.75		$ 0.75
Common stock warrants, exercise price	$ 0.50		$ 0.50
Convertible notes issued, principal amount			1,175,000	2,459,000	2,450,000	567,000
Proceeds from exercise of warrants			1,066,436us-gaap_ProceedsFromWarrantExercises	50,000us-gaap_ProceedsFromWarrantExercises	50,000us-gaap_ProceedsFromWarrantExercises	201,000us-gaap_ProceedsFromWarrantExercises
Payments on convertible notes payable				250,000us-gaap_RepaymentsOfConvertibleDebt	500,000us-gaap_RepaymentsOfConvertibleDebt
Issuance of common stock shares for notes payable			7,628,333		5,695,000
Common stock issued	59,259,116us-gaap_CommonStockSharesIssued		59,259,116us-gaap_CommonStockSharesIssued		55,753,311us-gaap_CommonStockSharesIssued	30,908,292us-gaap_CommonStockSharesIssued
Interest expense related amortization	254,485	402,467	1,298,825	3,449,868	3,807,320	1,703,616
Convertible Debt
Related Party Transaction [Line Items]
Proceeds from exercise of warrants			1,066,000
Alpha Venture Capital Partners, L.P.
Related Party Transaction [Line Items]
Face amount of notes	3,500,000		3,500,000				1,500,000	2,000,000
Convertible notes, interest payable rate							1.20%	5.00%
Convertible note maturity date			Sep. 26, 2016				May 05, 2015	Sep. 26, 2016
Convertible notes, conversion price	$ 1.00		$ 1.00				$ 1.00	$ 1.00
Percentage reduction to conversion price			10.00%				10.00%	10.00%
Sale price of common stock	$ 0.9444		$ 0.9444				$ 0.9444	$ 0.9444
Additional convertible promissory notes that may be issued	6,000,000		6,000,000				6,000,000	6,000,000
Warrants to purchase common shares, shares	325,000		325,000
Common stock warrants, exercise price	$ 0.50		$ 0.50				$ 0.50	$ 0.50
Alpha Venture Capital Partners, L.P. \| Detachable common stock warrants with a two-year term
Related Party Transaction [Line Items]
Warrants to purchase common shares, shares								250,000
Warrants, expiration date			Dec. 31, 2019
Alpha Venture Capital Partners, L.P. \| Detachable common stock warrants, with terms of two or three years
Related Party Transaction [Line Items]
Warrants to purchase common shares, shares							75,000
Warrants, expiration date			Feb. 28, 2020
Director \| Convertible Debt
Related Party Transaction [Line Items]
Convertible notes issued, principal amount			1,000,000
Common stock warrants issued	1,333,333		1,333,333
Proceeds from exercise of warrants			733,333
Convertible notes term			3 years
Note Payable 15% Due 2014
Related Party Transaction [Line Items]
Convertible notes, interest payable rate					15.00%
Convertible note maturity date					Apr. 11, 2014
Payments on convertible notes payable					500,000
Issuance of common stock shares for notes payable					150,000
Interest payable, per share of common stock					$ 0.50
Interest Expenses					64,700	10,300
Common stock issued					150,000
Note Payable 5% Due 2015
Related Party Transaction [Line Items]
Convertible notes, interest payable rate						5.00%
Convertible note maturity date						Oct. 16, 2015
Convertible notes, conversion price						$ 0.75
Common stock warrants, exercise price						$ 2.00
Common stock warrants issued						1,333,333
Convertible notes issued, principal amount						1,000,000
Common stock warrants, expire date						Oct. 16, 2014
Convertible note, carrying value					540,000
Interest expense related amortization					$ 334,000	$ 207,000