Income Taxes (Details)	3 Months Ended	12 Months Ended
Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2021
Effective Income Tax Rate Reconciliation, Percent	11.60%	18.20%
Forecast [Member]
Expected Tax Rate on Ordinary Income			21.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration