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Common Stock and Common Stock Payable Issued for Services - Additional Information (Detail) (USD $)
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3 Months Ended |
9 Months Ended |
12 Months Ended |
0 Months Ended |
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Feb. 28, 2014
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Feb. 28, 2014
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May 31, 2014
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May 31, 2013
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Dec. 28, 2012
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| Common Stock Issued For Services [Line Items] |
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| Stock-based compensation recognized |
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$ 928,413us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
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$ 3,261,951us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
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| Gain on settlement of accounts payable |
97,253us-gaap_GainLossOnNonRecourseDebt
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111,199us-gaap_GainLossOnNonRecourseDebt
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183,944us-gaap_GainLossOnNonRecourseDebt
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372,759us-gaap_GainLossOnNonRecourseDebt
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| Common stock payable |
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117,778cydy_CommonStockPayable
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| Minimum |
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| Common Stock Issued For Services [Line Items] |
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| Issue price per share |
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$ 0.40us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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$ 0.56us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Maximum |
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| Common Stock Issued For Services [Line Items] |
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| Issue price per share |
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$ 0.67us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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$ 0.89us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Director |
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| Common Stock Issued For Services [Line Items] |
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| Common stock issued for services |
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51,520us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
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| Stock-based compensation recognized |
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49,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
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| Director | Minimum |
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| Common Stock Issued For Services [Line Items] |
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| Issue price per share |
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$ 0.80us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
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| Director | Maximum |
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| Common Stock Issued For Services [Line Items] |
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| Issue price per share |
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$ 1.60us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
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| Consultant |
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| Common Stock Issued For Services [Line Items] |
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| Common stock issued for services |
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60,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantMember
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| Issue price per share |
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$ 2.68us-gaap_SharePrice
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantMember
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| Stock-based compensation recognized |
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161,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_TitleOfIndividualAxis
= cydy_ConsultantMember
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| Previous Principal Law Firm |
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| Common Stock Issued For Services [Line Items] |
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| Common stock issued for services |
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66,116us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= cydy_PreviousPrincipalLawFirmMember
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| Settlement of trade payable |
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447,000cydy_TradePayableSettlement
/ us-gaap_TitleOfIndividualAxis
= cydy_PreviousPrincipalLawFirmMember
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| Cash payment for service from previous principal law firm |
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45,000cydy_CashPaymentForServices
/ us-gaap_TitleOfIndividualAxis
= cydy_PreviousPrincipalLawFirmMember
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| Common stock issued for services, value |
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80,000us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= cydy_PreviousPrincipalLawFirmMember
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| Gain on settlement of accounts payable |
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322,000us-gaap_GainLossOnNonRecourseDebt
/ us-gaap_TitleOfIndividualAxis
= cydy_PreviousPrincipalLawFirmMember
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| Executives |
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| Common Stock Issued For Services [Line Items] |
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| Common stock issued for services |
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53,601us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Stock-based compensation recognized |
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0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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108,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Common stock payable |
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$ 108,000cydy_CommonStockPayable
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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