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v2.4.1.9

Marketable Securities (Schedule of classified marketable securities) (Details) (USD $) | 9 Months Ended | 12 Months Ended
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Apr. 30, 2015 | Jul. 31, 2014
Available-for-sale - Fair Value | $ 1,477,072us-gaap_AvailableForSaleSecurities | $ 1,354,213us-gaap_AvailableForSaleSecurities
Noncurrent [Member] |  |
Available-for-sale - Cost | 1,156,952us-gaap_AvailableForSaleSecuritiesAmortizedCost / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 1,117,801us-gaap_AvailableForSaleSecuritiesAmortizedCost / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Gains | 320,120us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 236,412us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Losses |  |
Available-for-sale - Fair Value | 1,477,072us-gaap_AvailableForSaleSecurities / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 1,354,213us-gaap_AvailableForSaleSecurities / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Noncurrent [Member] | Mutual Funds [Member] |  |
Available-for-sale - Cost | 716,050us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 691,047us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Gains | 141,481us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 129,173us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Losses |  |
Available-for-sale - Fair Value | 857,531us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 820,220us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mays_MutualFundsMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Noncurrent [Member] | Equity Securities [Member] |  |
Available-for-sale - Cost | 440,902us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 426,754us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Gains | 178,639us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | 107,239us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember
Available-for-sale - Gross Unrealized Losses |  |
Available-for-sale - Fair Value | $ 619,541us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember | $ 533,993us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / mays_MarketableSecuritiesAxis = mays_NoncurrentMember

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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