Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 759	$ 632
Common stock, no par value	$ 0.30	$ 0.30
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	31,606,831	31,606,831
Common stock, shares outstanding	22,136,981	21,875,850
Treasury shares	9,469,850	9,730,981