CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - UNAUDITED (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Class A [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividend (in dollars per share)	$ 0.3450	$ 0.3425	$ 0.3450	$ 0.3425
Class B [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividend (in dollars per share)	$ 0.3450	$ 0.3425	$ 0.3450	$ 0.3425