Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income	$ 488,765	$ 596,219	$ 18,594
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(53,616)	12,883	16,409
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(7,575)	23,276	25,635
Comprehensive income	$ 427,574	$ 632,378	$ 60,638