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Operating Leases (Schedule of rental expense) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Leases [Abstract]
Sublease income	$ 1,810,962	$ 1,740,248	$ 3,597,138	$ 3,468,281
Operating lease cost	(832,709)	(832,707)	(1,665,420)	(1,665,420)
Excess of sublease income over lease cost	$ 978,253	$ 907,541	$ 1,931,718	$ 1,802,861

X

- Definition

Excess of sublease income over expense.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of sublease rental income recognized during the period that reduces the entity's rental expense incurred under operating leases.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration