LOSS PER SHARE AND STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	3,700	3,400	3,700	3,400
Basic weighted average common shares (in shares)	194,077	205,532	198,064	206,242
Shares repurchased during the period, (in shares)			300	200
Shares repurchased during the period, value			$ 9.4	$ 5.0
Shares issued during period (in shares)	1,000	700
Nonvested units granted			1,500
Stock-based compensation	$ 6.6	$ 6.2	$ 22.7	$ 18.0
Unrecognized compensation costs, options	0.3		0.3
Unrecognized compensation costs, nonvested shares and units	$ 40.6		$ 40.6