Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Ordinary Shares [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, value at Mar. 31, 2008	$ 8,240,832	$ 8,790,740	$ (547,799)	$ (2,109)
Balance, shares at Mar. 31, 2008		835,203,000
Repurchase of ordinary shares at cost, value	(260,074)	(260,074)
Repurchase of ordinary shares at cost, shares		(29,780,000)
Issuance of ordinary shares for acquisitions, value	270	270
Issuance of ordinary shares for acquisitions, shares		141,000
Exercise of stock options, value	13,848	13,848
Exercise of stock options, shares	2,242,639	2,243,000
Issuance of vested shares under share bonus awards		1,826,000
Net income (loss)	(6,135,518)		(6,135,518)
Stock-based compensation, net of tax	57,150	57,150
Unrealized gain (loss) on derivative instruments, and other income (loss), net of taxes	(22,983)			(22,983)
Foreign currency translation	(32,357)			(32,357)
Balance, value at Mar. 31, 2009	1,861,168	8,601,934	(6,683,317)	(57,449)
Balance, shares at Mar. 31, 2009		809,633,000
Exercise of stock options, value	6,026	6,026
Exercise of stock options, shares	2,496,254	2,497,000
Issuance of vested shares under share bonus awards		1,299,000
Net income (loss)	18,594		18,594
Stock-based compensation, net of tax	56,735	56,735
Unrealized gain (loss) on derivative instruments, and other income (loss), net of taxes	25,635			25,635
Foreign currency translation	16,409			16,409
Balance, value at Mar. 31, 2010	1,984,567	8,664,695	(6,664,723)	(15,405)
Balance, shares at Mar. 31, 2010		813,429,000
Repurchase of ordinary shares at cost, value	(400,400)	(400,400)
Repurchase of ordinary shares at cost, shares		(65,411,000)
Exercise of stock options, value	23,299	23,299
Exercise of stock options, shares	6,215,867	6,217,000
Issuance of vested shares under share bonus awards		2,759,000
Net income (loss)	596,219		596,219
Stock-based compensation, net of tax	54,852	54,852
Unrealized gain (loss) on derivative instruments, and other income (loss), net of taxes	23,276			23,276
Foreign currency translation	12,883			12,883
Balance, value at Mar. 31, 2011	$ 2,294,696	$ 8,342,446	$ (6,068,504)	$ 20,754
Balance, shares at Mar. 31, 2011		756,994,000