COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 14,104	$ 40,859	$ (41,980)	$ 70,512
Foreign currency translation adjustment	(2,783)	(3,210)	(12,023)	3,872
Comprehensive income (loss)	$ 11,321	$ 37,649	$ (54,003)	$ 74,384