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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		6 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018
Earnings Per Share [Abstract]
Net Income	$ 23.8	$ 14.6	$ 52.1	$ 38.3
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Denominator for Basic Income per Share-Weighted Average Shares Outstanding and Vested/Unissued Restricted Stock Units (in shares)	37,587,742	37,405,550	37,561,098	37,377,997
Dilutive Potential Common Shares-Employee Stock Options, Restricted Stock Awards and Restricted Stock Units (in shares)	151,446	268,172	142,025	270,051
Denominator for Diluted Income per Share (in shares)	37,739,188	37,673,722	37,703,123	37,648,048
Basic and Diluted Income per Share:
Basic Income per Share (in dollars per share)	$ 0.63	$ 0.39	$ 1.39	$ 1.02
Diluted Income per Share (in dollars per share)	$ 0.63	$ 0.39	$ 1.38	$ 1.02

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