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NET INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Jan. 26, 2019
Jan. 27, 2018
Earnings Per Share [Abstract]                
Numerator - Net Income (Loss) $ 30.7 $ 14.6 $ 23.7 $ (24.3) $ 24.2 $ 20.5 $ 69.0 $ 20.4
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     37,292,934     37,387,181 37,275,041
Dilutive potential common shares-employee and director stock options, restricted stock awards and restricted stock units (in shares) 248,700     0     250,289 385,979
Denominator for diluted net income per share (in shares) 37,654,250     37,292,934     37,637,470 37,661,020
Net Income (Loss) per Share:                
Basic (in dollars per share) $ 0.82     $ (0.65)     $ 1.84 $ 0.54
Diluted (in dollars per share) $ 0.82     $ (0.65)     $ 1.83 $ 0.54