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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends paid (in usd per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.74	$ 0.66
Stock options exercised, (in shares)									19,800	36,800

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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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