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Related Party Transactions (Schedule of Summarizes Assets and Liabilities) (Details) - USD ($)	6 Months Ended
	Jan. 31, 2022	Jul. 31, 2021
Related Party Transaction [Line Items]
Operating Lease Right-Of-Use Assets	$ 33,295,406	$ 34,566,169
Operating lease liabilities	27,180,303	27,840,930
Chairman of the Board of Directors [Member]
Related Party Transaction [Line Items]
Operating Lease Right-Of-Use Assets	14,855,431	15,673,776
Operating lease liabilities	7,527,722	7,905,756
Chairman of the Board of Directors [Member] | Jamaica Avenue at 169th Street [Member]
Related Party Transaction [Line Items]
Operating Lease Right-Of-Use Assets	12,143,954	12,842,642
Operating lease liabilities	$ 2,820,742	4,959,450
Expiration Date	May 31, 2030
Chairman of the Board of Directors [Member] | 504-506 Fulton Street [Member]
Related Party Transaction [Line Items]
Operating Lease Right-Of-Use Assets	$ 2,711,477	2,831,134
Operating lease liabilities	$ 4,706,980	$ 2,946,306
Expiration Date	Apr. 30, 2031

X

- Definition

Date which lease or group of leases is set to expire, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=mays_JamaicaAvenueAt169thStreetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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