Related Party Transactions (Details) - Schedule of assets and liabilities - USD ($)	6 Months Ended
Jan. 31, 2025	Jul. 31, 2024
Right Of Use Assets [Member]
Related Party Transaction [Line Items]
Right-Of-Use Assets	$ 13,248,093	$ 12,767,974
Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	$ 8,167,982	7,216,899
Jamaica Avenue at 169th Street [Member]
Related Party Transaction [Line Items]
Expiration Date	May 31, 2035
Jamaica Avenue at 169th Street [Member] \| Right Of Use Assets [Member]
Related Party Transaction [Line Items]
Right-Of-Use Assets	$ 10,177,615	10,600,247
Jamaica Avenue at 169th Street [Member] \| Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	$ 4,745,568	4,905,360
504-506 Fulton Street [Member]
Related Party Transaction [Line Items]
Expiration Date	Apr. 30, 2031
504-506 Fulton Street [Member] \| Right Of Use Assets [Member]
Related Party Transaction [Line Items]
Right-Of-Use Assets	$ 2,031,287	2,167,727
504-506 Fulton Street [Member] \| Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	$ 2,184,571	2,311,539
508 Fulton Street [Member]
Related Party Transaction [Line Items]
Expiration Date	Apr. 30, 2044
508 Fulton Street [Member] \| Right Of Use Assets [Member]
Related Party Transaction [Line Items]
Right-Of-Use Assets	$ 1,039,191
508 Fulton Street [Member] \| Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	$ 1,237,843

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=MAYS_RightOfUseAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=MAYS_JamaicaAvenueAt169thStreetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=MAYS_FiveHundredFour506FultonStreetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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