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

Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

Subsequent Events - Additional Information (Detail) - USD ($)								1 Months Ended	3 Months Ended
	Oct. 07, 2019	Oct. 03, 2019	Sep. 24, 2019	Sep. 19, 2019	Sep. 12, 2019	Sep. 10, 2019	Aug. 29, 2019	Sep. 30, 2019	Aug. 31, 2019	May 31, 2019
Subsequent Event [Line Items]
Common stock issuance for redemption of covertible note									3,014,181
Debt outstanding amount									$ 4,900,247	$ 3,586,035
Subscription Agreement [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price							$ 0.45
Number of shares to be sold							5,639,500
Term of warrants							5 years
Warrants to purchase common shares, shares							2,819,750
Purchase price, per share							$ 0.40
Proceeds from issuance of common shares							$ 2,000,000
Subsequent Event
Subsequent Event [Line Items]
Class of warrants, exercise price								$ 0.30
Warrants to purchase common shares, shares								200,000
Stock options, term	10 years				10 years
Term of warrants								5 years
Stock options grant date fair value	$ 0.19
Subsequent Event \| 2019 Short Term Convertible Notes
Subsequent Event [Line Items]
Debt outstanding amount								$ 5,870,000
Debt Instrument, maturity date								Apr. 01, 2020
Convertible note, aggregate principal								$ 215,000
Conversion rate price per share								$ 0.40
Subsequent Event \| 2019 Short Term Convertible Notes \| Tranche One [Member]
Subsequent Event [Line Items]
Debt outstanding amount								$ 2,200,000
Subsequent Event \| 2019 Short Term Convertible Notes \| Tranche Two [Member]
Subsequent Event [Line Items]
Debt outstanding amount								$ 2,300,000
Subsequent Event \| Convertible Promissory Notes
Subsequent Event [Line Items]
Class of warrants, exercise price								$ 0.30
Warrants to purchase common shares, shares								2,100,000
Debt Instrument, maturity date								Apr. 01, 2020
Convertible note, aggregate principal								$ 2,200,000
Term of warrants								5 years
Subsequent Event \| DrScottA Kelly [Member] \| Two Thousand Twelve Stock Incentive Plan [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price					750,000
Subsequent Event \| DrWelch [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	187,500				250,000
Stock option granted, exercise price	$ 0.39				$ 0.385
Subsequent Event \| DrWelch [Member] \| 2019 Short Term Convertible Notes \| Tranche Two [Member]
Subsequent Event [Line Items]
Convertible note, aggregate principal								$ 1,000,000
Subsequent Event \| DrWelch [Member] \| Convertible Promissory Notes
Subsequent Event [Line Items]
Warrants to purchase common shares, shares								1,000,000
Convertible note, aggregate principal								$ 1,075,343
Subsequent Event \| DrWelch [Member] \| Two Thousand Twelve Stock Incentive Plan [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price					250,000
Subsequent Event \| Subscription Agreement [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price				$ 0.45
Number of shares to be sold		1,382,500		2,330,000
Term of warrants				5 years
Warrants to purchase common shares, shares				1,165,000
Purchase price, per share		$ 0.40		$ 0.40
Proceeds from issuance of common shares				$ 900,000
Subsequent Event \| 2019 Subscription Agreement
Subsequent Event [Line Items]
Class of warrants, exercise price		$ 0.45
Term of warrants		5 years
Warrants to purchase common shares, shares		691,250
Proceeds from issuance of common shares		$ 600,000
Subsequent Event \| Convertible Notes Payable
Subsequent Event [Line Items]
Outstanding balance of convertible note including accrued unpaid interest			$ 3,500,000
Convertible note, redeemed amount			$ 175,000			$ 175,000
Common stock issuance for redemption of covertible note			1,116,340
Subsequent Event \| Consultant [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price					200,000
Stock option vested, Shares	200,000
Stock option granted, exercise price					$ 0.385
Subsequent Event \| Consultant [Member] \| Share-based Compensation Award, Tranche One [Member]
Subsequent Event [Line Items]
Stock option vested, Shares					100,000
Subsequent Event \| Consultant [Member] \| Share-based Compensation Award, Tranche Two [Member]
Subsequent Event [Line Items]
Stock options, term					10 years
Stock option vested, Shares					100,000
Subsequent Event \| Consultants And Employees [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	1,062,500
Stock option granted, exercise price	$ 0.39
Subsequent Event \| Employees [Member]
Subsequent Event [Line Items]
Stock option vested, Shares	862,500