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Schedule of Contractual Maturities of Available-for-sale Debt Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jul. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Within one year	$ 5,048
After one year through five years	5,986
After five years through ten years	5,399
After ten years	419
Total	$ 16,852	$ 18,363

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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