Schedule of Contractual Maturities of Available-for-sale Debt Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Within one year	$ 2,489
After one year through five years	7,463
After five years through ten years	3,771
After ten years	289
TOTAL	$ 14,012	$ 18,363