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

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Weighted Average Assumptions to Value Investor Warrants (Detail)

v3.2.0.727

Weighted Average Assumptions to Value Investor Warrants (Detail) - $ / shares	12 Months Ended
	May. 31, 2015	May. 31, 2014
Debt and Financial Instruments [Line Items]
Expected dividend yield	0.00%	0.00%
Stock price volatility	80.68%
Expected term	6 months
Risk-free interest rate	0.12%
Grant-date fair value	$ 0.15
Investor warrants
Debt and Financial Instruments [Line Items]
Expected dividend yield	0.00%
Stock price volatility	88.79%
Expected term	5 years
Minimum
Debt and Financial Instruments [Line Items]
Stock price volatility		78.00%
Expected term		3 years
Risk-free interest rate		0.64%
Grant-date fair value		$ 0.66
Minimum \| Investor warrants
Debt and Financial Instruments [Line Items]
Risk-free interest rate	1.46%
Grant-date fair value	$ 0.52
Maximum
Debt and Financial Instruments [Line Items]
Stock price volatility		93.00%
Expected term		5 years
Risk-free interest rate		1.42%
Grant-date fair value		$ 0.72
Maximum \| Investor warrants
Debt and Financial Instruments [Line Items]
Risk-free interest rate	1.58%
Grant-date fair value	$ 0.76

- Definition

Debt and Financial Instruments [Line Items]

+ References

No definition available.

+ Details

Name:	cydy_DebtAndFinancialInstrumentsLineItems
Namespace Prefix:	cydy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Agreed upon price for the exchange of the underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=cydy_InvestorWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: