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Income Per Share - Schedule of the Computation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Earnings Per Share [Abstract]
Net Income (in millions)	$ 22.6	$ 30.7	$ 14.6	$ 23.7	$ 36.8	$ (24.3)	$ 24.2	$ 20.5	$ 91.6	$ 57.2	$ 92.9
Denominator for basic earnings per share-weighted average shares outstanding and vested/unissued restricted stock awards (in shares)									37,405,298	37,281,630	37,283,096
Dilutive potential common shares-employee, restricted stock awards and restricted stock units (in shares)									264,262	260,269	202,605
Denominator for diluted earnings per share (in shares)									37,669,560	37,541,899	37,485,701
Basic income per share (in dollars per share)									$ 2.45	$ 1.54	$ 2.49
Diluted income per share (in dollars per share)									$ 2.43	$ 1.52	$ 2.48

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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