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Document and Entity Information - USD ($)
 6 Months Ended
Jun. 30, 2018
Aug. 30, 2018
Document And Entity Information    
Entity Registrant Name GraniteShares Platinum Trust  
Entity Central Index Key 0001690842  
Document Type 10-K  
Document Period End Date Jun. 30, 2018  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Entity a Well-known Seasoned Issuer No  
Entity a Voluntary Filer No  
Entity's Reporting Status Current Yes  
Entity Filer Category Smaller Reporting Company  
Entity Public Float $ 3,820,887  
Entity Common Stock, Shares Outstanding   45,000
Trading Symbol PLTM  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2018