SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 31, 2013
Dividend Payments [Abstract]
Total dividend payout		$ 3,200	$ 2,700	$ 6,300	$ 5,400
Share Repurchase Program [Member]
Share Repurchase Program [Abstract]
Authorized amount of stock repurchase	$ 97,300					$ 67,300
Increase to existing share repurchase program	$ 30,000
Share repurchases yet to be purchased under authorization		$ 54,000		$ 54,000
Stock repurchased and retired to date (in shares)		1.6		1.6
Stock repurchased and retired to date		$ 43,300		$ 43,300
Repurchase of common stock (in shares)		0.0	0.0	0.0	0.0