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Income Taxes - Schedule of Components of Income before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Components of Income/(Loss) Before Income Taxes [Abstract]      
Domestic Source $ 11.4 $ 21.6 $ 25.3
Foreign Source 112.4 94.3 85.6
Income before Income Taxes $ 123.8 $ 115.9 $ 110.9