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Changes in Number of Shares Issued (Detail) (Common Stock)
12 Months Ended
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Stockholders Equity Note [Line Items]      
Beginning balance 110,229,948 92,217,067 92,193,067
Issuance of common stock 0 18,000,000 0
Exercise of stock options 14,000 11,000 24,000
Conversion of convertible bonds 1,898 1,881 0
Ending balance 110,245,846   92,217,067