CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Ordinary Shares	Retained Earnings (Deficit)	Total accumulated other comprehensive income (loss)	Unrealized gain (loss) on derivative instruments and other	Foreign currency translation adjustments
BALANCE at Mar. 31, 2010	$ 1,984,567	$ 8,664,695	$ (6,664,723)	$ (15,405)	$ (13,803)	$ (1,602)
BALANCE (in shares) at Mar. 31, 2010		813,429,000
Increase (Decrease) in Shareholders' Equity
Repurchase of ordinary shares at cost	(400,400)	(400,400)
Repurchase of ordinary shares at cost (in shares)		(65,411,000)
Exercise of stock options	23,299	23,299
Exercise of stock options (in shares)	6,215,867	6,217,000
Issuance of vested shares under share bonus awards (in shares)		2,759,000
Net income	596,219		596,219
Stock-based compensation, net of tax	54,852	54,852
Total other comprehensive (loss) income	36,159			36,159	23,276	12,883
BALANCE at Mar. 31, 2011	2,294,696	8,342,446	(6,068,504)	20,754	9,473	11,281
BALANCE (in shares) at Mar. 31, 2011		756,994,000
Increase (Decrease) in Shareholders' Equity
Repurchase of ordinary shares at cost	(509,800)	(509,800)
Repurchase of ordinary shares at cost (in shares)		(81,688,000)
Exercise of stock options	23,055	23,055
Exercise of stock options (in shares)	5,879,405	5,879,000
Issuance of vested shares under share bonus awards (in shares)		2,555,000
Net income	488,765		488,765
Stock-based compensation, net of tax	48,454	48,454
Total other comprehensive (loss) income	(61,191)			(61,191)	(7,575)	(53,616)
BALANCE at Mar. 31, 2012	2,283,979	7,904,155	(5,579,739)	(40,437)	1,898	(42,335)
BALANCE (in shares) at Mar. 31, 2012	683,740,173	683,740,000
Increase (Decrease) in Shareholders' Equity
Repurchase of ordinary shares at cost	(334,014)	(334,014)
Repurchase of ordinary shares at cost (in shares)		(51,725,000)
Exercise of stock options	22,257	22,257
Exercise of stock options (in shares)	5,398,331	5,398,000
Issuance of vested shares under share bonus awards (in shares)		1,507,000
Net income	277,051		277,051
Stock-based compensation, net of tax	34,529	34,529
Total other comprehensive (loss) income	(37,044)			(37,044)	(20,755)	(16,289)
BALANCE at Mar. 31, 2013	$ 2,246,758	$ 7,626,927	$ (5,302,688)	$ (77,481)	$ (18,857)	$ (58,624)
BALANCE (in shares) at Mar. 31, 2013	638,919,784	638,920,000