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
	Jun. 14, 2017	Nov. 30, 2017	Nov. 30, 2017	May 31, 2017	May 31, 2010	Aug. 24, 2017	Jun. 19, 2017	Aug. 24, 2016	Mar. 18, 2016	Mar. 17, 2016	Apr. 30, 2010
Class of Stock [Line Items]
Common stock, shares authorized		375,000,000	375,000,000	350,000,000		375,000,000		350,000,000	250,000,000	200,000,000	100,000,000
Non-cash debt discount			$ 1,172,995
Amortization of debt issuance costs		$ 168,429	$ 282,129
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
Short-Term Convertible Notes
Class of Stock [Line Items]
Conversion price				$ 0.75
Convertible note, aggregate principal		$ 4,890,000	$ 4,890,000	$ 1,150,000
Convertible note maturity date				Jan. 31, 2018
Convertible notes, interest rate				7.00%
Common stock warrants to purchase shares							383,333
Debt discount		493,000	493,000	$ 92,000
Unamortized issuance costs		$ 153,500	$ 153,500
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			1,200,000	$ 0
Unamortized issuance costs		$ 400,000	400,000
Amortization of debt issuance costs			$ 300,000
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