COMMON STOCK REPURCHASES (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock	$ 34,236	$ 497,393	$ 112,939
Remaining shares authorized for repurchase under program	869,835
Value of shares withheld in satisfaction of employee tax withholding obligations	$ 9,736	$ 11,068	$ 7,611
Treasury stock retired (shares)	0	0	0
Open Market Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock, shares	764,176	9,077,223	2,221,448
Repurchase of common stock	$ 34,200	$ 497,400	$ 112,900
Repurchase of common stock, average price per share (in dollars per share)	$ 44.80	$ 54.80	$ 50.84