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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 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 53,016,271 52,837,262
Common stock, shares outstanding 20,936,089 21,520,248
Treasury stock, shares 32,080,182 31,317,014