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
	Jul. 29, 2017	Jul. 30, 2016
Earnings Per Share [Abstract]
Numerator - Net Income	$ 20.5	$ 21.2
Denominator for basic net income per share-weighted average shares outstanding and vested/unissued restricted stock awards (in shares)	37,248,689	37,322,548
Dilutive potential common shares-employee and director stock options, restricted stock awards and restricted stock units (in shares)	312,551	146,744
Denominator for diluted net income per share (in shares)	37,561,240	37,469,292
Net Income per Share:
Basic (in dollars per share)	$ 0.55	$ 0.57
Diluted (in dollars per share)	$ 0.55	$ 0.57