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Summary of Accounting Policies (Narrative 2) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	4 Months Ended	12 Months Ended
	Jul. 14, 2009	Aug. 11, 2009	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009	Mar. 31, 2008
Total number of ordinary shares consisting of grants of incentive and nonqualified stock options and share bonus awards to be issued under the 2010 Plan			56,400,000
Unrecognized compensation expense related to share bonus awards, performance based			$ 83.9
Weighted-average period for amortization of compensation cost related to share bonus awards, in years			2.3
Recognition of excess tax benefits as a financing cash inflow related to its equity compensation plans			0	0	0
Stock options granted in accordance with The Exchange		16,900,000	2,063,748	869,600	43,586,251
Stock price at options exercisable, per share			$ 7.66
Stock options tendered in the exchange		27,900,000	53,942,458	62,868,569	81,927,879	52,541,413
Exercise price of options exercised			$ 7.44	$ 6.54	$ 6.13
Rate of existing options per new options grant	1.5
Options exercisable, end of fiscal year, price			$ 9.23	$ 10.71	$ 12.51
Exercise Price of options granted under the exchange		$ 5.57
Weighted average vesting term of options granted under the exchange		1.58
Contractual life of stock options granted under the exchange		7
Weighted average remaining contractual life for options exercisable			3.9
Incremental compensation expense over the expected service period of the replacement grants		1.8
Aggregate intrinsic value of options exercised			22.9	10.3	6.3
Cash received from option exercises			23.3	6.0	13.8
Aggregate intrinsic value for options vested			19.6	7.0	17.2
Share-based compensation arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			52,893,459
Target amount of grants made to certain key employees			1,200,000
Number of unvested share bonus awards granted to certain key employees whereby vesting is contingent on a market condition					1,930,000
Number of shares that can be issued			830,745,010	843,208,876
Grant-date fair value of the awards			$ 2.80	$ 2.75	$ 2.22
Accounts receivables and related bank borrowings				217.1
Maximum [Member]
Number of shares that can be issued			1,800,000
Minimum [Member]
Number of shares that can be issued			0
Stock-Based Awards Activity [Member]
Unrecognized compensation expense related to share bonus awards, performance based			22.8
Probable achievable goals			322,500
Stock compensation			3.2
Exercise price of options exercised	$ 10.00
Exercise prices, lower limit	$ 10.00
Exercise prices, upper limit	$ 11.99
Rate of existing options per new options grant	2.4
Options exercisable, end of fiscal year, price	$ 12.00
Number of shares available eligible to participate in exchange	29,800,000
Aggregate intrinsic value of options exercised			39.7
Aggregate intrinsic value for options outstanding			100.2
Aggregate intrinsic value for options vested			97.3
Monte Carlo Simulation [Member]
Grant-date fair value of the awards			$ 7.32
Unvested Stock Options [Member]
Unrecognized compensation expense related to share bonus awards, performance based			$ 30.9
Weighted-average period for amortization of compensation cost related to share bonus awards, in years			1.3
Key Employees [Member]
Stock options granted in accordance with The Exchange					2,700,000
Stock price at options exercisable, per share					$ 12.50
Grant-date fair value of the awards					$ 4.25
In The Money [Member]
Share-based compensation arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			28,600,000