Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Mar. 31, 2016
Statement of Financial Position [Abstract]
Common stock, no par value	$ 0	$ 0
Common stock, stated value	$ 0.3	$ 0.3
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	31,606,831	31,606,831
Common stock, shares outstanding	23,210,682	22,942,586
Treasury shares	8,396,149	8,664,245