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Long-Term Debt - Mortgages (Schedule of long-term debt) (Details) (USD $)	9 Months Ended
	Apr. 30, 2015	Jan. 09, 2015	Jul. 31, 2014
Due Within One Year	$ 149,422mays_LongTermDebtWithinOneYear		$ 240,000mays_LongTermDebtWithinOneYear
Due After One Year	5,825,014mays_LongTermDebtWithinAfterYear		5,181,335mays_LongTermDebtWithinAfterYear
Fishkill, New York Property [Member]
Due Within One Year			68,112mays_LongTermDebtWithinOneYear / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember
Due After One Year			1,470,463mays_LongTermDebtWithinAfterYear / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember
Current Annual Interest Rate	6.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember
Final Payment Date	Feb. 18, 2015
Bond St. Building, Brooklyn, N Y [Member]
Due Within One Year			171,888mays_LongTermDebtWithinOneYear / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYMember
Due After One Year			3,710,872mays_LongTermDebtWithinAfterYear / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYMember
Current Annual Interest Rate	6.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYMember
Final Payment Date	Feb. 18, 2015
Bond St. building, Brooklyn, NY [Member]
Due Within One Year	149,422mays_LongTermDebtWithinOneYear / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember
Due After One Year	$ 5,825,014mays_LongTermDebtWithinAfterYear / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember
Current Annual Interest Rate	3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember	3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember
Final Payment Date	Feb. 01, 2020

X

- Definition

Amount of long term debt due after year.

+ References

No definition available.

+ Details

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Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of long term debt due within one year.

+ References

No definition available.

+ Details

Name:	mays_LongTermDebtWithinOneYear
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Period Type: