CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2015
Mar. 31, 2014
CONSOLIDATED BALANCE SHEETS    
Ordinary shares, par value (in dollars per share) $ 0 $ 0
Ordinary shares, issued 613,562,761 641,666,347
Ordinary shares, outstanding 563,323,406 591,426,992
Treasury stock, shares 50,239,355 50,239,355