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v2.4.1.9

Lease Modification Agreement (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2015 | Jun. 16, 2014
Related Party Transaction [Line Items] |  |  |
Amortization of deferred revenue per month |  | $ 97,000mays_AmortizationOfDeferredRevenuePerMonth |
Revenue recognized | 291,667us-gaap_DeferredRevenueRevenueRecognized | 875,001us-gaap_DeferredRevenueRevenueRecognized |
Expected annual amortization | 1,166,667us-gaap_DeferredRevenueLeasesAccumulatedAmortization | 1,166,667us-gaap_DeferredRevenueLeasesAccumulatedAmortization |
33 Bond St. LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Deferred revenue |  |  | 3,500,000us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionAxis = mays_ThirtyThreeBondStreetLlcMember
Tendered amount with execution of the Amendment |  |  | 2,250,000us-gaap_AccountsReceivableRelatedParties / us-gaap_RelatedPartyTransactionAxis = mays_ThirtyThreeBondStreetLlcMember
Balance due |  |  | $ 1,250,000us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionAxis = mays_ThirtyThreeBondStreetLlcMember

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