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Organization and Business (Details) shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 46 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2010 USD ($) a shares | Mar. 31, 2016 a | Mar. 31, 2016 a | Oct. 31, 2018 USD ($) | Jan. 08, 2015 USD ($) | Sep. 29, 2014 | Sep. 01, 2012 a
Subsidiary shares issued | shares | 1.6 |  |  |  |  |  |
Acreage of Unpatented Mining Claims-Alaska |  |  |  |  |  |  | 71,896
Royal Gold initial investment | $ |  |  |  |  | $ 5.0 |  |
Royal Gold percentage of interest in Joint Venture |  |  |  |  | 0.00% |  |
Contango's percentage of interest in Joint Venture Company |  |  |  |  | 100.00% |  |
royalgoldjointventure | $ |  |  |  | $ 30.0 |  |  |
joint adventure economic interest |  |  |  |  | 40.00% |  |
additional new mining claims-state of Alaska |  | 59 | 59 |  |  |  |
unpatented mining claims-Eagle |  | 9,439 | 9,439 |  |  |  |
Native Village of Tetlin Land [Member] |  |  |  |  |  |  |
Percentage of Leasehold Interest | 100.00% |  |  |  |  |  |
Leasehold Interest Acreage | 675,000 |  |  |  |  |  |
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage |  | 10 years | 10 years |  |  |  |
Contango [Member] |  |  |  |  |  |  |
Parent contribution | $ | $ 3.5 |  |  |  |  |  |
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% |  |  | 2.00% | 2.00%
Unpatented Mining Claims from the State of Alaska for Gold and Minerals [Member] |  |  |  |  |  |  |
Acreage of Unpatented Mining Claims | 18,021 |  |  |  |  |  |

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