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
	Jan. 31, 2018	Jun. 14, 2017	Feb. 28, 2018	Feb. 28, 2018	Feb. 28, 2017	May 31, 2017	May 31, 2010	Nov. 01, 2017	Sep. 08, 2017	Aug. 24, 2017	Jun. 19, 2017	Aug. 24, 2016	Aug. 23, 2016	Apr. 30, 2010
Class of Stock [Line Items]
Common stock, shares authorized			375,000,000	375,000,000		350,000,000		200,000,000		375,000,000		350,000,000	250,000,000	100,000,000
Common stock, par value			$ 0.001	$ 0.001		$ 0.001
Non-cash debt discount				$ 1,666,017
Amortization of debt issuance costs			$ 153,480	435,609
Proceeds from sale of common stock and warrant				22,903,710	$ 19,133,755
Repayment of note				$ 259,157
Common Stock
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock			10	10
Conversion price			$ 0.50	$ 0.50
Investor
Class of Stock [Line Items]
Exercise price of warrants, per share			$ 0.50	$ 0.50					$ 0.75
Short-Term Convertible Notes
Class of Stock [Line Items]
Conversion price						$ 0.75
Convertible note, aggregate principal	$ 6,000,000		$ 4,890,000	$ 4,890,000		$ 1,150,000
Convertible note maturity date	Jan. 31, 2018					Jan. 31, 2018
Convertible notes, interest rate						7.00%
Exercise price of warrants, per share	$ 0.75
Common stock warrants to purchase shares	7,718,010										383,333
Term of warrants	5 years
Debt discount						$ 92,000
Unamortized issuance costs			$ 0	0		$ 0
Payment obligation against which common stock issued	$ 5,788,500
Accrued but unpaid interest	$ 243,000
Number of shares to be sold	12,062,728
Sale of Stock, Price Per Share	$ 0.50
Proceeds from sale of common stock and warrant	$ 6,000,000
Repayment of note	$ 259,000			$ 250,000
Short-Term Convertible Notes \| Minimum
Class of Stock [Line Items]
Warrant covering common stock shares purchased, percentage		25.00%
Exercise price of warrants, per share		$ 1.00
Short-Term Convertible Notes \| Maximum
Class of Stock [Line Items]
Warrant covering common stock shares purchased, percentage		50.00%
Exercise price of warrants, per share		$ 1.35
Short-Term Convertible Notes \| Investor Warrants
Class of Stock [Line Items]
Exercise price of warrants, per share			$ 1.00	$ 1.00		$ 1.00
Common stock warrants to purchase shares			4,025,656	4,025,656		4,025,656
Term of warrants				5 years		5 years
Short-Term Convertible Notes \| Detachable Common Stock Warrants
Class of Stock [Line Items]
Debt discount			$ 1,600,000	$ 1,600,000		$ 92,000.0
Non-cash debt discount				1,600,000		$ 0
Unamortized issuance costs			$ 400,000	400,000
Amortization of debt issuance costs				$ 400,000
2013 Convertible Notes \| Detachable Common Stock Warrants \| Investor
Class of Stock [Line Items]
Exercise price of warrants, per share	$ 0.75
2013 Convertible Notes \| Detachable Common Stock Warrants \| Minimum \| Investor
Class of Stock [Line Items]
Exercise price of warrants, per share	0.75
2013 Convertible Notes \| Detachable Common Stock Warrants \| Maximum \| Investor
Class of Stock [Line Items]
Exercise price of warrants, per share	$ 1.00
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Series B Convertible preferred stock, shares issued			92,100	92,100		92,100	400,000
Preferred Stock, Share issuance price							$ 5.00
Cash proceeds							$ 2,009,000
Series B Convertible preferred stock, shares outstanding			92,100	92,100		92,100
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
Convertible preferred stock, par value			$ 0.001	$ 0.001		$ 0.001	$ 0.001