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Summary of Significant Accounting and Reporting Policies (Research and Development Costs) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Research and development expenses reimbursed by customers	$ 13,635,000	$ 11,923,000	$ 14,679,000

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- References

No definition available.

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- Definition

The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23221-108380

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23199-108380

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