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SHARE-BASED COMPENSATION (Details 6) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Share-based compensation      
Weighted average fair value (in dollars per share) $ 2.48 $ 2.57 $ 2.80
Share bonus awards
     
Share-based compensation      
Unvested share bonus awards, beginning of period (in shares) 15,965,268 13,801,942 8,801,609
Granted (in shares) 9,582,867 9,213,456 9,739,375
Vested (in shares) (1,506,234) (2,555,165) (2,758,593)
Forfeited (in shares) (2,234,832) (4,494,965) (1,980,449)
Unvested share bonus awards, end of period (in shares) 21,807,069 15,965,268 13,801,942
Unvested share bonus awards, weighted average grant-date fair value, beginning of period (in dollars per share) $ 6.91 $ 8.04 $ 10.31
Unvested share bonus awards granted, weighted average grant-date fair value (in dollars per share) $ 6.74 $ 6.78 $ 7.01
Unvested share bonus awards vested, weighted average grant-date fair value (in dollars per share) $ 7.51 $ 9.34 $ 10.37
Unvested share bonus awards forfeited, weighted average grant-date fair value (in dollars per share) $ 6.86 $ 8.60 $ 9.74
Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share) $ 6.80 $ 6.91 $ 8.04
Aggregate intrinsic value of stock options vested and expected to vest $ 9.7 $ 17.7 $ 19.6
Share Bonus Awards with Market Conditions
     
Share-based compensation      
Granted (in shares) 2,100,000 1,000,000 800,000
Unvested share bonus awards, weighted average grant-date fair value, beginning of period (in dollars per share) $ 7.78 $ 7.32  
Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share) $ 7.63 $ 7.78 $ 7.32
Actual number of shares to be issued 4,100,000 1,600,000 1,200,000
Number of unvested share bonus awards granted to certain key employees whereby vesting is contingent on market condition 3,900,000    
Vesting period 3 years    
Share Bonus Awards with Market Conditions | Minimum
     
Share-based compensation      
Actual number of shares to be issued 0 0 0
Vesting period 3 years    
Share Bonus Awards with Market Conditions | Maximum
     
Share-based compensation      
Vesting period 5 years