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Oil and Gas Reserve Data (Unaudited) - Schedule of Commodity Prices Utilized for Reserve Estimates the Prior to Adjustments (Details) - $ / shares | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Oil [Member] |  |
Prices utilized for reserve estimates | $ 49.94 | $ 44.10
Natural Gas [Member] |  |
Prices utilized for reserve estimates | $ 3.00 | $ 2.74

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- Definition Prices utilized for reserve estimates. + References No definition available. + Details
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Namespace Prefix: | MXC_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ReserveQuantitiesByTypeOfReserveAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |