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	6 Months Ended		12 Months Ended
	Jan. 06, 2020	Jan. 02, 2020	Dec. 31, 2019	Dec. 30, 2019	Dec. 24, 2019	Dec. 23, 2019	Dec. 20, 2019	Dec. 19, 2019	Dec. 16, 2019	Dec. 13, 2019	Dec. 09, 2019	Dec. 06, 2019	Dec. 02, 2019	Oct. 07, 2019	Sep. 12, 2019	Dec. 31, 2019	Nov. 30, 2019	Nov. 30, 2018	May 31, 2019	Sep. 30, 2019
Subsequent Event [Line Items]
Class of warrants, exercise price																				$ 0.45
Common stock, par value																	$ 0.001		$ 0.001
Warrants to purchase common shares, shares																				200,000
Convertible note, redeemed amount																	$ 214,959	$ 0
Common stock issuance for redemption of covertible note																	4,746,935
Share Price																			1,000
Stock options, term														10 years	10 years
Proceeds From Exercise Of Warrants																	$ 11,900,260	$ 0
2019 Short Term Convertible Notes
Subsequent Event [Line Items]
Outstanding balance of convertible note including accrued unpaid interest			$ 549,912													$ 549,912
Common stock conversion price			$ 0.50
Shares issued on conversion			1,099,823
January 2019 Note [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price																			$ 0.30
Warrants to purchase common shares, shares																			5,000,000
Common stock conversion price																	$ 0.50		$ 0.50
Subscription Agreement [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price																	$ 0.45
Number of shares to be sold																	19,100,333
Term of warrants																	5 years
Warrants to purchase common shares, shares																	11,987,250
Proceeds from issuance of common shares																	$ 0
Subscription Agreement [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Purchase price, per share																	$ 0.40
Subscription Agreement [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Purchase price, per share																	$ 0.30
Subsequent Event
Subsequent Event [Line Items]
Vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	210,000
Stock options, term	10 years
Stock option granted, exercise price	$ 0.98
Subsequent Event \| Definitive Subscription Agreement [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price						$ 0.305
Number of shares to be sold						14,754,098
Warrants to purchase common shares, shares						7,377,049
Sale of Stock, Description of Transaction						Each share of common stock was sold together with one-half of one warrant to purchase one share of common stock
Subsequent Event \| January 2019 Note [Member]
Subsequent Event [Line Items]
Outstanding balance of convertible note including accrued unpaid interest									$ 4,200,000
Convertible note, redeemed amount		$ 1,150,000							$ 350,000
Common stock issuance for redemption of covertible note									2,300,000
Common stock conversion price									$ 0.50
Subsequent Event \| Private Warrant Exchange [Member]
Subsequent Event [Line Items]
Common stock, par value				$ 0.001			$ 0.001
Share Price				$ 0.50
Proceeds From Exercise Of Warrants				$ 1,000,000			$ 800,000
Stock issued during period shares warrant exercise				2,676,000			4,690,000
Subsequent Event \| Private Warrant Exchange [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price							$ 0.75
Share Price							0.25
Subsequent Event \| Private Warrant Exchange [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price							0.45
Share Price							$ 0.22
Subsequent Event \| Additional Shares [Member] \| Private Warrant Exchange [Member]
Subsequent Event [Line Items]
Stock issued during period shares warrant exercise				446,000			1,340,000
Subsequent Event \| Actual Shares [Member] \| Private Warrant Exchange [Member]
Subsequent Event [Line Items]
Stock issued during period shares warrant exercise				2,230,000			3,350,000
Subsequent Event \| Subscription Agreement [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price											$ 0.45	$ 0.30
Number of shares to be sold										2,433,333	2,568,330
Term of warrants												5 years
Warrants to purchase common shares, shares											1,926,248	1,037,500
Outstanding balance of convertible note including accrued unpaid interest													$ 2,600,000
Convertible note, redeemed amount													$ 350,000
Purchase price, per share										$ 0.30	$ 0.30	$ 1,000
Proceeds from issuance of common shares											$ 750,000	$ 380,000
Subsequent Event \| 2019 Subscription Agreement
Subsequent Event [Line Items]
Class of warrants, exercise price										$ 0.45
Term of warrants										5 years	5 years
Warrants to purchase common shares, shares										1,825,000
Proceeds from issuance of common shares										$ 730,000
Subsequent Event \| Directors And Officers [Member]
Subsequent Event [Line Items]
Class of warrants, exercise price								$ 0.63
Warrants to purchase common shares, shares								2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price								7,300,000
Stock option vested, Shares																0
Stock option granted, exercise price			$ 0.63													$ 0.63
Stock option granted, exercise price								$ 0.63
Subsequent Event \| Directors And Officers [Member] \| Share-based Compensation Award, Tranche One [Member]
Subsequent Event [Line Items]
Stock option vested, Shares								6,050,000
Subsequent Event \| Directors And Officers [Member] \| Share-based Compensation Award, Tranche Two [Member]
Subsequent Event [Line Items]
Stock option vested, Shares								1,250,000
Subsequent Event \| Two Executives [Member]
Subsequent Event [Line Items]
Shares issued under compensation plan					379,880
Shares withheld for tax withholding obligation					126,997
Phoenixus AG [Member] \| Subsequent Event \| Definitive Subscription Agreement [Member]
Subsequent Event [Line Items]
Minority interest amount						$ 4,000,000
Related party Entity [Member] \| Subsequent Event \| Definitive Subscription Agreement [Member]
Subsequent Event [Line Items]
Minority interest amount						$ 500,000