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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended
Mar. 13, 2014
lawsuit
May 09, 2012
item
Mar. 31, 2015
Jun. 30, 2014
Shareholder Lawsuits        
LITIGATION AND OTHER LEGAL MATTERS        
Provision for possible loss     $ 0us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LitigationCaseAxis
= hdy_ShareholderLawsuitsMember		  
Class actions filed 2us-gaap_LossContingencyNewClaimsFiledNumber
/ us-gaap_LitigationCaseAxis
= hdy_ShareholderLawsuitsMember		      
Iroquois Lawsuit        
LITIGATION AND OTHER LEGAL MATTERS        
Provision for possible loss     0us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LitigationCaseAxis
= hdy_IroquoisLawsuitMember		  
Number of plaintiffs which filed lawsuit   5us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= hdy_IroquoisLawsuitMember		    
Damages sought   18,500,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= hdy_IroquoisLawsuitMember		    
Maximum possible loss   18,500,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LitigationCaseAxis
= hdy_IroquoisLawsuitMember		    
Foreign Corrupt Practices Act Investigations        
LITIGATION AND OTHER LEGAL MATTERS        
Loss contingency amounts related to potential fines, sanctions or other penalties     0us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LitigationCaseAxis
= hdy_ForeignCorruptPracticesActInvestigationsMember		  
Legal and other professional fees     $ 3,700,000us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= hdy_ForeignCorruptPracticesActInvestigationsMember		 $ 7,500,000us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= hdy_ForeignCorruptPracticesActInvestigationsMember