The value for additional mortgage loan for capital improvements.

No definition available.

Name:	mays_AdditionalMortgageLoansForCapitalImprovements
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount for closed bank liabilities.

+ References

No definition available.

+ Details

Name:	mays_ClosedBankLiabilities
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of collateralized debt as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Representing long term debt refinanced amount.

+ References

No definition available.

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

LONG-TERM DEBT - MORTGAGES AND TERM LOAN (Narrative) (Details) (USD $)		12 Months Ended	36 Months Ended
	Jul. 31, 2013	Jul. 31, 2005 Bond St. Building, Brooklyn, N Y [Member]	Jul. 31, 2008 Bond St. Building, Brooklyn, N Y [Member]	Aug. 19, 2004 Bond St. Building, Brooklyn, N Y [Member]	Aug. 19, 2004 Permanent Subordinate Mortgage [Member] Fishkill, New York Property [Member]	Aug. 19, 2004 Multiple Successively Subordinate Loans [Member] Fishkill, New York Property [Member]
Closed bank liabilities		$ 12,000,000
Secured debt					1,870,000	8,295,274
Refinanced amount				1,834,726
Additional loans		2,820,000	916,670
Debt maturing in 2014	170,262
Debt maturing in 2015	5,421,335
Collateralized Debt	$ 23,126,330