SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Jul. 31, 2016	Mar. 31, 2015
Share Repurchase Program [Abstract]
Repurchases of common stock				$ 13,040
Payments of Dividends [Abstract]
Total dividend payout		$ 13,611	$ 11,715	$ 9,970
Share Repurchase Program [Member]
Share Repurchase Program [Abstract]
Authorized amount of stock repurchase					$ 97,300
Increase to existing share repurchase program	$ 21,000
Share repurchases yet to be purchased under authorization		$ 75,000
Stock repurchased and retired to date (in shares)		1,600,000
Stock repurchased and retired to date		$ 43,300
Repurchase of common stock (in shares)		0	0	325,000
Repurchases of common stock				$ 13,000
Average cost per share including commissions (in dollars per share)				$ 40.18
Common Stock Warrants [Member]
Common Stock Warrants [Abstract]
Warrants outstanding (in shares)		0	0	0		4,000
Weighted average exercise price (in dollars per share)				$ 3.00		$ 3.00
Common stock issued upon exercise of vested warrants (in shares)		0	0	4,000