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Fair Value (Future Principal Receipts Related to Available-For-Sale Security by Contractual Maturity) (Details) $ in Thousands	Apr. 30, 2023 USD ($)
Available For Sale Securities [Abstract]
Amortized Cost, Within one year	$ 186
Amortized Cost, After one year through five years	1,236
Amortized Cost, After five years through ten years	1,872
Amortized Cost, After ten years	2,399
Amortized Cost, Total	5,693
Estimated Fair Value, Within one year	167
Estimated Fair Value, After one year through five years	1,146
Estimated Fair Value, After five years through ten years	1,783
Estimated Fair Value, After ten years	2,320
Estimated Fair Value, Total	$ 5,416

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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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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 second through fifth 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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