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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2018
Mar. 31, 2018
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 53,839,539 53,793,986
Common stock, shares outstanding 18,891,907 18,912,907
Treasury stock, shares 34,947,632 34,881,079