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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends paid (in usd per share)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0.19	$ 0.19		$ 0.38
Stock options exercised, (in shares)									0	2,300

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Number of share options (or share units) exercised during the current period.

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