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Oil and Gas Costs (Details Narrative) - $ / shares | Mar. 31, 2018 | Mar. 31, 2017
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Extractive Industries [Abstract] |  |
DD&A per BOE production | $ 10.02 | $ 12.47

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- Definition DD&amp;amp;A per BOE production. + References No definition available. + Details
Name: | MXC_DepreciationDepletionAndAmortizationBerolOfOilEquivalent
Namespace Prefix: | MXC_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | srt_ExtractiveIndustriesAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration