Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net Cash Provided By Used In Operating Activities [Abstract]
Net income (loss)	$ 26,267	$ 17,970
Income from discontinued operations	0	(409)
Depreciation and amortization	9,116	8,609
Deferred income taxes and related valuation allowance	153	378
Gain on sale of real estate/investments	(431)	(1,909)
Gain on disposal of assets	0	(850)
Stock-based compensation	2,474	2,246
Amortization of deferred financing costs	226	289
Non-cash restructuring charges	0	0
Increase Decrease In Operating Capital [Abstract]
Trade accounts receivable	(9,330)	775
Inventories	4,129	(14,011)
Prepaid expenses	(345)	2,440
Other assets	415	332
Trade accounts payable	8,835	(927)
Accrued and non-current liabilities	(16,212)	(1,774)
Net Cash Provided By Used In Operating Activities	26,287	13,463
Net Cash Provided By Used In Investing Activities [Abstract]
Proceeds from sale of marketable securities	4,907	5,747
Purchases of marketable securities	(2,724)	(4,503)
Capital expenditures	(7,139)	(10,464)
AcquisitionCosts		(3,356)
Proceeds from sale of businesses or assets	2,357	1,971
Net cash used for investing activities from continuing operations	(2,599)	(10,605)
Net cash provided by investing activities from discontinued operations	0	409
Net cash used for investing activities	(2,599)	(10,196)
Net Cash Provided By Used In Financing Activities [Abstract]
Proceeds from exercise of stock options	232	1,733
Net payments under lines-of-credit	(52)	(238)
Repayments of debt	592	488
Change in ESOP guarantee	(318)	(324)
Net cash provided by (used) for financing activities	(778)	1,331
Payments of Financing Costs	(684)
Effect Of Exchange Rate On Cash And Cash Equivalents	(446)	(2,704)
Cash And Cash Equivalents Period Increase Decrease	22,464	1,894
Cash And Cash Equivalents At Carrying Value - Beginning of Period	89,473	80,139
Cash And Cash Equivalents At Carrying Value - End of Period	111,937	82,033
Supplemental Cash Flow Information [Abstract]
Interest Paid	10,227	10,202
Income Taxes Paid	$ 3,591	$ 5,272