Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v2.4.1.9
Related Party Transactions - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended 0 Months Ended
Feb. 28, 2015
Feb. 28, 2014
May 31, 2014
Feb. 06, 2015
Sep. 26, 2014
Related Party Transaction [Line Items]          
Face amount of notes $ 0cydy_ConvertibleNotesFaceAmount   $ 1,200,000cydy_ConvertibleNotesFaceAmount    
Debt conversion price $ 0.75us-gaap_DebtInstrumentConvertibleConversionPrice1        
Exercise price of warrants, per share $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1        
Convertible notes issued, principal amount 1,175,000us-gaap_DebtConversionConvertedInstrumentAmount1 2,459,000us-gaap_DebtConversionConvertedInstrumentAmount1 2,450,000us-gaap_DebtConversionConvertedInstrumentAmount1    
Proceeds from exercise of warrants 1,066,436us-gaap_ProceedsFromWarrantExercises 50,000us-gaap_ProceedsFromWarrantExercises      
Convertible Debt          
Related Party Transaction [Line Items]          
Proceeds from exercise of warrants 1,066,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Alpha Venture Capital Partners, L.P.          
Related Party Transaction [Line Items]          
Face amount of notes 3,500,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    1,500,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		2,000,000cydy_ConvertibleNotesFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Interest rate on convertible notes       1.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Convertible note maturity date Sep. 26, 2016     May 05, 2015 Sep. 26, 2016
Debt conversion price $ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    $ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		$ 1.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Percentage reduction to conversion price 10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		10.00%cydy_PercentageOfCurrentConversionPriceLowerThanClosingSalePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Sale price of common stock $ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    $ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		$ 0.9444us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Additional convertible promissory notes that may be issued 6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		6,000,000cydy_AdditionalDebtInstrumentFaceAmountThatMayBeIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Warrants to purchase common shares, shares 325,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		       
Exercise price of warrants, per share $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		    $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		$ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Alpha Venture Capital Partners, L.P. | Detachable common stock warrants with a two-year term          
Related Party Transaction [Line Items]          
Warrants to purchase common shares, shares         250,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cydy_WarrantOneMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember
Warrants, expiration date Dec. 31, 2019        
Alpha Venture Capital Partners, L.P. | Detachable common stock warrants, with terms of two or three years          
Related Party Transaction [Line Items]          
Warrants to purchase common shares, shares       75,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cydy_WarrantTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cydy_AlphaVentureCapitalPartnersLPMember 		 
Warrants, expiration date Feb. 28, 2020        
Director | Convertible Debt          
Related Party Transaction [Line Items]          
Convertible notes issued, principal amount 1,000,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember 		       
Common stock warrants issued 1,333,333us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember 		       
Proceeds from exercise of warrants $ 733,333us-gaap_ProceedsFromWarrantExercises
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember 		       
Convertible notes term 3 years