Shareholders' Equity - Dividends (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 01, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash dividends	$ (5.2)	$ (5.0)	$ (5.0)
Description of changes in dividends rate	increased its quarterly dividend from $0.11 per share to $0.14 per share
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash dividends		$ (0.9)