EARNINGS PER SHARE ("EPS") (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Computation of Basic earnings per share:
Net income	$ 99,321	$ 71,815	$ 187,826	$ 118,095
Weighted average shares outstanding—basic (in shares)	114,444	113,117	114,153	112,869
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.63	$ 1.65	$ 1.05
Computation of Diluted earnings per share:
Net income	$ 99,321	$ 71,815	$ 187,826	$ 118,095
Weighted average shares outstanding—basic (in shares)	114,444	113,117	114,153	112,869
Add: dilutive effect of common stock equivalents (in shares)	970	960	1,092	1,056
Weighted average common shares outstanding—diluted (in shares)	115,414	114,077	115,245	113,925
Diluted earnings per share (in dollars per share)	$ 0.86	$ 0.63	$ 1.63	$ 1.04