SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONSOLIDATED FINANCIAL STATEMENTS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Condensed consolidating statements of comprehensive income (loss)
Net income (loss)	$ 365,594	$ 277,051	$ 488,765
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(34,683)	(16,289)	(53,616)
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(13,992)	(20,755)	(7,575)
Comprehensive income	316,919	240,007	427,574
Parent | Reportable legal entities
Condensed consolidating statements of comprehensive income (loss)
Net income (loss)	365,594	277,051	488,765
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(34,683)	(16,289)	(53,616)
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(13,992)	(20,755)	(7,575)
Comprehensive income	316,919	240,007	427,574
Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of comprehensive income (loss)
Net income (loss)	83,222	207,119	257,820
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(23,634)	6,464	40,899
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(6,229)	(21,084)	(943)
Comprehensive income	53,359	192,499	297,776
Non-Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of comprehensive income (loss)
Net income (loss)	(40,121)	(554,580)	247,718
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(89,635)	10,377	755
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(13,992)	(20,755)	(7,575)
Comprehensive income	(143,748)	(564,958)	240,898
Eliminations
Condensed consolidating statements of comprehensive income (loss)
Net income (loss)	(43,101)	347,461	(505,538)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	113,269	(16,841)	(41,654)
Unrealized gain (loss) on derivative instruments and other, net of zero tax	20,221	41,839	8,518
Comprehensive income	$ 90,389	$ 372,459	$ (538,674)