Earnings Per Share (Schedule Of Basic And Diluted Weighted-Average Ordinary Shares Outstanding Used To Calculate Basic And Diluted Earnings Per Share) (Details) (USD $)	0 Months Ended	3 Months Ended				9 Months Ended
	Aug. 02, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2011		Dec. 31, 2010
Earnings Per Share [Abstract]
Net income		$ 102,177,000		$ 198,290,000		$ 364,032,000		$ 460,884,000
Weighted-average ordinary shares outstanding		710,324,000		762,387,000		726,432,000		783,128,000
Basic earnings per share		$ 0.14		$ 0.26		$ 0.50		$ 0.59
Weighted-average ordinary share equivalents from stock options and awards		10,570,000	[1]	14,208,000	[1]	10,823,000	[1]	11,833,000	[1]
Weighted-average ordinary shares and ordinary share equivalents outstanding		720,894,000	[2]	776,595,000	[2]	737,255,000	[2]	794,961,000	[2]
Diluted earnings per share		$ 0.14		$ 0.26		$ 0.49		$ 0.58
Antidilutive securities excluded from computation of earnings per share stock options amount		24,800,000		25,300,000		26,200,000		25,700,000
Amount paid for redemption of Convertible Subordinated Notes	$ 240,000,000
Debt instrument interest percentage	1.00%
Conversion price of Convertible Subordinated Notes	$ 15.525

[1] Ordinary share equivalents from stock options to purchase approximately 24.8 million shares and 25.3 million shares outstanding during the three-month periods ended December 31, 2011 and December 31, 2010, were excluded from the computation of diluted earnings per share primarily because the exercise price of these options was greater than the average market price of the Company's ordinary shares during the respective periods. Ordinary share equivalents from stock options to purchase approximately 26.2 million shares and 25.7 million shares outstanding during the nine-month periods ended December 31, 2011 and December 31, 2010, were excluded from the computation of diluted earnings per share primarily because the exercise price of these options was greater than the average market price of the Company's ordinary shares during the respective periods.

[2] On August 2, 2010 the Company paid approximately $240.0 million to redeem its 1% Convertible Subordinated Notes upon maturity. The notes carried conversion provisions to issue shares to settle any conversion spread (excess of the conversion value over the conversion price) in stock. The conversion price was $15.525 per share (subject to certain adjustments). On the maturity date, the Company's stock price was less than the conversion spread, and therefore no shares were issued. During the nine-month period ended December 31, 2010, the conversion obligation was less than the principal portion of these notes and accordingly, no additional shares were included as ordinary share equivalents.