Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2017	Nov. 15, 2017	Dec. 31, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	HYPERDYNAMICS CORP
Entity Central Index Key	0000937136
Document Type	10-K
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 40,793,217
Entity Common Stock, Shares Outstanding		35,572,445
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY