Declaration of Dividend Payable (Details) - $ / shares		3 Months Ended		9 Months Ended
	Nov. 12, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Dividends [Abstract]
Cash dividends payable, declared date	Nov. 12, 2019
Cash dividends declared per common share (in usd per share)	$ 0.11	$ 0.11	$ 0.11	$ 0.33	$ 0.33