General form of registration statement for all companies including face-amount certificate companies

Acquisition of Patents - Additional Information (Detail)

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Acquisition of Patents - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
May 31, 2014
Oct. 16, 2012
Oct. 31, 2012
May 31, 2014
May 31, 2013
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Business Acquisition [Line Items]                  
Asset purchase, cash paid $ 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets $ 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets $ 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets   $ 3,500,000us-gaap_PaymentsToAcquireIntangibleAssets        
Intangible asset acquired           3,500,000us-gaap_FiniteLivedPatentsGross   3,500,000us-gaap_FiniteLivedPatentsGross  
Accrued liabilities related to contingent payments           0us-gaap_BusinessCombinationContingentConsiderationLiability   0us-gaap_BusinessCombinationContingentConsiderationLiability  
Amortization expense related to intangible patents       350,000us-gaap_AmortizationOfIntangibleAssets 219,000us-gaap_AmortizationOfIntangibleAssets        
Estimated aggregate future amortization expense in year one 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths     350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Estimated aggregate future amortization expense in year two 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo     350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Estimated aggregate future amortization expense in year three 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree     350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Estimated aggregate future amortization expense in year four 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour     350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Estimated aggregate future amortization expense in year five 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive     350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Estimated aggregate future amortization expense in year six           350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix  
Estimated aggregate future amortization expense in year seven           350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven   350,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven  
Estimated aggregate future amortization expense in year eight           219,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearEight   219,000cydy_FiniteLivedIntangibleAssetsAmortizationExpenseYearEight  
Estimated life       10 years          
Patents                  
Business Acquisition [Line Items]                  
Asset purchase, cash paid   3,500,000us-gaap_PaymentsToAcquireIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		             
Remaining approximate life               8 years  
Amortization expense related to intangible patents           $ 87,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 87,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 262,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember 		$ 262,500us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Estimated life               10 years