EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Computation of Basic earnings per share:
Net income	$ 163,642	$ 179,948	$ 281,737	$ 277,007
Weighted average shares outstanding—basic	113,251	113,433	112,996	113,390
Basic earnings per share (in dollars per share)	$ 1.44	$ 1.59	$ 2.49	$ 2.44
Computation of Diluted earnings per share:
Net income	$ 163,642	$ 179,948	$ 281,737	$ 277,007
Weighted average shares outstanding—basic	113,251	113,433	112,996	113,390
Add: dilutive effect of common stock equivalents (in shares)	1,003	1,304	1,013	1,528
Weighted average common shares outstanding—diluted	114,254	114,737	114,009	114,918
Diluted earnings per share (in dollars per share)	$ 1.43	$ 1.57	$ 2.47	$ 2.41