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Organization and Business (Details)
shares in Millions
 3 Months Ended 21 Months Ended 46 Months Ended
Nov. 29, 2010
USD ($)
a
shares
Sep. 30, 2016
USD ($)
Rate
Sep. 30, 2016
USD ($)
Rate
Oct. 31, 2018
USD ($)
Sep. 30, 2015
Jan. 08, 2015
USD ($)
Sep. 29, 2014
Sep. 01, 2012
a
Subsidiary shares issued | shares 1.6              
Acreage of Unpatented Mining Claims-Alaska | a               71,896
Royal Gold initial investment           $ 5,000,000    
Contango's percentage of interest in Joint Venture Company   85.00% 85.00%   100.00%      
royalgoldjointventure       $ 30,000,000        
joint adventure economic interest           40.00%    
Investment by Joint Venture Partner   $ 2,700,000 $ 13,400,000          
Royal Alaska Joint Venture Percentage | Rate   15.10% 15.10%          
Native Village of Tetlin Land [Member]                
Percentage of Leasehold Interest 100.00%              
Leasehold Interest Acreage | a 675,000              
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage   10 years            
Contango [Member]                
Parent contribution $ 3,500,000              
JEX [Member]                
Overriding royalty interest   3.00% 3.00%          
JEX [Member] | ALASKA                
the number of unpatented state of Alaska mining claims               474
Overriding royalty interest             2.00% 2.00%
Unpatented Mining Claims from the State of Alaska for Gold and Minerals [Member]                
Acreage of Unpatented Mining Claims | a 18,021