Summary Financial Information (Consolidated Statements of Cash Flows ) (Details) (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 Cash Provided By Used In Operating Activities	$ 26,287	$ 13,463
Net Cash Provided By Used In Investing Activities [Abstract]
Purchase of marketable securities, net	2,183	(1,244)
Capital expenditures	(7,139)	(10,464)
Net Cash Provided By Used In Investing Activities	(2,599)	(10,196)
Proceeds from sale of businesses or assets	2,357	1,971
Net cash provided by investing activities from discontinued operations	0	409
Proceeds from sale of marketable securities	4,907	5,747
Purchases of marketable securities	2,724	4,503
AcquisitionCosts		(3,356)
Net Cash Provided By Used In Financing Activities [Abstract]
Net payments under lines-of-credit	(52)	(238)
Other	(958)	(164)
Net Cash Provided By Used In Financing Activities	(778)	1,331
Proceeds from exercise of stock options	232	1,733
Payments of Financing Costs	(684)
Repayments Of Long Term Debt And Capital Securities	(592)	(488)
Increase Decrease In Employee Stock Options Guarantee	(318)	(324)
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
Parent Company [Member]
Net Cash Provided By Used In Operating Activities [Abstract]
Net Cash Provided By Used In Operating Activities	15,908	8,044
Net Cash Provided By Used In Investing Activities [Abstract]
Purchase of marketable securities, net	0	0
Capital expenditures	(4,683)	(8,553)
Net Cash Provided By Used In Investing Activities	(4,683)	(6,173)
Proceeds from sale of businesses or assets		1,971
Net cash provided by investing activities from discontinued operations		409
Net Cash Provided By Used In Financing Activities [Abstract]
Net payments under lines-of-credit		0
Other	(160)	324
Net Cash Provided By Used In Financing Activities	72	2,057
Proceeds from exercise of stock options	232	1,733
Effect Of Exchange Rate On Cash And Cash Equivalents	0	0
Cash And Cash Equivalents Period Increase Decrease	11,297	3,928
Cash And Cash Equivalents At Carrying Value - Beginning of Period	55,958	45,954
Cash And Cash Equivalents At Carrying Value - End of Period	67,255	49,882
Guarantor Subsidiaries [Member]
Net Cash Provided By Used In Operating Activities [Abstract]
Net Cash Provided By Used In Operating Activities	(1,715)	2,942
Net Cash Provided By Used In Investing Activities [Abstract]
Purchase of marketable securities, net		0
Capital expenditures	(445)	(702)
Net Cash Provided By Used In Investing Activities	1,912	(702)
Proceeds from sale of businesses or assets	2,357
Net Cash Provided By Used In Financing Activities [Abstract]
Net payments under lines-of-credit		0
Other	(202)	(177)
Net Cash Provided By Used In Financing Activities	(202)	(177)
Effect Of Exchange Rate On Cash And Cash Equivalents	0	0
Cash And Cash Equivalents Period Increase Decrease	(5)	2,063
Cash And Cash Equivalents At Carrying Value - Beginning of Period	5	7
Cash And Cash Equivalents At Carrying Value - End of Period	0	2,070
Non-Guarantor Subsidiaries [Member]
Net Cash Provided By Used In Operating Activities [Abstract]
Net Cash Provided By Used In Operating Activities	12,094	2,477
Net Cash Provided By Used In Investing Activities [Abstract]
Purchase of marketable securities, net	2,183	(1,244)
Capital expenditures	(2,011)	(1,209)
Net Cash Provided By Used In Investing Activities	172	(3,321)
AcquisitionCosts		(3,356)
Net Cash Provided By Used In Financing Activities [Abstract]
Net payments under lines-of-credit	(52)	(238)
Other	(596)	(311)
Net Cash Provided By Used In Financing Activities	(648)	(549)
Effect Of Exchange Rate On Cash And Cash Equivalents	(446)	(2,704)
Cash And Cash Equivalents Period Increase Decrease	11,172	(4,097)
Cash And Cash Equivalents At Carrying Value - Beginning of Period	33,510	34,178
Cash And Cash Equivalents At Carrying Value - End of Period	44,682	30,081
Consolidation, Eliminations [Member]
Net Cash Provided By Used In Operating Activities [Abstract]
Net Cash Provided By Used In Operating Activities	0
Net Cash Provided By Used In Financing Activities [Abstract]
Other	0
Net Cash Provided By Used In Financing Activities	0
Effect Of Exchange Rate On Cash And Cash Equivalents	$ 0