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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. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Earnings Per Share [Abstract]        
Numerator - Net Income $ 24.2 $ 24.9 $ 44.7 $ 45.9
Denominator for basic net income per share-weighted average shares outstanding and vested/unissued restricted stock awards (in shares) 37,283,500 37,353,423 37,266,095 37,337,985
Dilutive potential common shares-employee and director stock options, restricted stock awards and restricted stock units (in shares) 384,600 187,827 363,545 156,234
Denominator for diluted net income per share (in shares) 37,668,100 37,541,250 37,629,640 37,494,219
Net Income per Share:        
Basic (in dollars per share) $ 0.65 $ 0.66 $ 1.20 $ 1.23
Diluted (in dollars per share) $ 0.64 $ 0.66 $ 1.19 $ 1.23