DEFERRED CHARGES (Schedule of estimated aggregate amortization expense) (Details) (USD $)	Jul. 31, 2014
DEFERRED CHARGES [Abstract]
2015	$ 336,030
2016	289,729
2017	220,331
2018	177,903
2019	$ 102,735

Name:	mays_DeferredChargesAbstract
Namespace Prefix:	mays_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for deferred charges.

No definition available.

Name:	mays_DeferredChargesAmortizationExpenseNextTwelveMonths
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred charges.

No definition available.

Name:	mays_DeferredChargesAmortizationExpenseYearFive
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred charges.

No definition available.

Name:	mays_DeferredChargesAmortizationExpenseYearFour
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred charges.

No definition available.

Name:	mays_DeferredChargesAmortizationExpenseYearThree
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred charges.

No definition available.

Name:	mays_DeferredChargesAmortizationExpenseYearTwo
Namespace Prefix:	mays_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant