Summary Financial Information (Consolidated Statements of Cash Flows ) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net cash provided by (used for) operating activities	$ 38,254	$ 29,507	$ 42,378
Investing activities:
Proceeds from sale of marketable securities	6,919	6,689	6,573
Purchases of marketable securities	(3,689)	(4,099)	(4,138)
Capital expenditures	(17,243)	(20,846)	(14,879)
Proceeds from sale of assets	(74)	0	2,357
Purchases of businesses, net of cash	(19,992)us-gaap_AcquisitionCosts	(22,169)us-gaap_AcquisitionCosts	0us-gaap_AcquisitionCosts
Net cash used for investing activities	(34,079)	(40,425)	(10,087)
Financing activities:
Proceeds from exercise of stock options	1,607	2,194	295
Payments under line-of-credit agreements		(7)	(54)
Repayment of debt	(157,203)	(858)	(1,066)
Payment of deferred financing costs	(1,825)us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	(684)us-gaap_PaymentsOfFinancingCosts
Change in ESOP debt guarantee	(859)	410	423
Net cash provided by (used for) financing activities	(48,387)	1,739	(1,086)
Effect of exchange rate changes on cash	(5,041)	(172)	982
Net change in cash and cash equivalents	(49,253)	(9,351)	32,187
Cash and cash equivalents at beginning of year	112,309	121,660	89,473
Cash and cash equivalents at end of year	$ 63,056	$ 112,309	$ 121,660

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash outflow for loan and debt issuance costs.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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