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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Sep. 07, 2018
Dec. 29, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name Paramount Gold Nevada Corp.    
Entity Central Index Key 0001629210    
Current Fiscal Year End Date --06-30    
Entity Filer Category Smaller Reporting Company    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2018    
Trading Symbol PZG    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   25,474,954  
Entity Public Float     $ 21.5