Financial Instruments and Credit Risk Concentrations (Details) - tenants	9 Months Ended	12 Months Ended
Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020
Allowance for Uncollectible Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk	55.00%		55.00%
Number of tenants	4		4
Customer One [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Concentration risk	30.00%	43.00%
Number of tenants	2	3

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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