Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 632	$ 661
Inventories, allowances	1,066	1,851
Intangible assets, accumulated amortization	$ 21,560	$ 20,068
Common stock, par value
Common stock, stated 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	21,875,850	23,022,398
Treasury shares	9,730,981	8,584,433