EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,300	3,700
Basic weighted average common shares (in shares)	192,598	202,037
Shares repurchased during the period, (in shares)	200	300
Shares repurchased during the period, value	$ 2.9	$ 9.2
Shares issued during period (in shares)	600	900
Nonvested units granted (in shares)	1,800
Stock-based compensation	$ 7.6	$ 6.7
Unrecognized compensation costs, nonvested shares and units	$ 53.8