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NET 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. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Earnings Per Share [Abstract]        
Numerator - Net Income $ 14.6 $ 24.2 $ 38.3 $ 44.7
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Denominator for basic net income per share-weighted average shares outstanding and vested/unissued restricted stock awards (in shares) 37,405,550 37,283,500 37,377,997 37,266,095
Dilutive potential common shares-employee and director stock options, restricted stock awards and restricted stock units (in shares) 268,172 384,600 270,051 363,545
Denominator for diluted net income per share (in shares) 37,673,722 37,668,100 37,648,048 37,629,640
Net Income per Share:        
Basic (in dollars per share) $ 0.39 $ 0.65 $ 1.02 $ 1.20
Diluted (in dollars per share) $ 0.39 $ 0.64 $ 1.02 $ 1.19