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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2012 | Mar. 31, 2011
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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

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