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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Mar. 31, 2013
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 52,959,304 52,837,262
Common stock, shares outstanding 20,984,675 21,520,248
Treasury stock, shares 31,974,629 31,317,014