Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 609	$ 632
Intangible assets, accumulated amortization	$ 22,099	$ 21,560
Common stock, no 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	22,104,245	21,875,850
Treasury shares	9,502,586	9,730,981