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Income per Share - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 01, 2020
Earnings Per Share [Abstract]
Net income	$ 29.1	$ 20.7	$ 20.7
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Denominator for basic income per share - weighted average shares outstanding and vested/unissued restricted stock units	37,939,488	37,836,543
Dilutive potential common shares	518,470	321,875
Denominator for diluted income per share	38,457,958	38,158,418
Basic and diluted income per share:
Basic Income per Share (in dollars per share)	$ 0.77	$ 0.55	$ 0.55
Diluted Income per Share (in dollars per share)	$ 0.76	$ 0.54	$ 0.54
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	928,412	101,668

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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